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BaseRepresentation
bin10000001010101110000…
…001001111001010101101
310221012201222020210012122
4100022232001033022231
5121200332401402341
62210221314242325
7143161065502133
oct20125601171255
93835658223178
101111021122221
113991aa50626a
1215b3a68863a5
13809cc1b9a7a
143bab90b5753
151dd7831394b

1111021122221 has 4 divisors (see below), whose sum is σ = 1111061127744. Its totient is φ = 1110981116700.

The previous prime is 1111021122181. The next prime is 1111021122229. The reversal of 1111021122221 is 1222211201111.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-1111021122221 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1111021122221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1111021122229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19961075 + ... + 20016656.

It is an arithmetic number, because the mean of its divisors is an integer number (277765281936).

Almost surely, 21111021122221 is an apocalyptic number.

It is an amenable number.

1111021122221 is a deficient number, since it is larger than the sum of its proper divisors (40005523).

1111021122221 is an equidigital number, since it uses as much as digits as its factorization.

1111021122221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40005522.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 1111021122221 its reverse (1222211201111), we get a palindrome (2333232323332).

The spelling of 1111021122221 in words is "one trillion, one hundred eleven billion, twenty-one million, one hundred twenty-two thousand, two hundred twenty-one".

Divisors: 1 27791 39977731 1111021122221