1111022100021 has 4 divisors (see below), whose sum is σ = 1481362800032. Its totient is φ = 740681400012.

The previous prime is 1111022100017. The next prime is 1111022100047. The reversal of 1111022100021 is 1200012201111.

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 not a de Polignac number, because 1111022100021 - 2² = 1111022100017 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1111022100521) 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, 185170350001 + ... + 185170350006.

It is an arithmetic number, because the mean of its divisors is an integer number (370340700008).

Almost surely, 2^{1111022100021} is an apocalyptic number.

It is an amenable number.

1111022100021 is a deficient number, since it is larger than the sum of its proper divisors (370340700011).

1111022100021 is an equidigital number, since it uses as much as digits as its factorization.

1111022100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 370340700010.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 1111022100021 its reverse (1200012201111), we get a palindrome (2311034301132).

The spelling of 1111022100021 in words is "one trillion, one hundred eleven billion, twenty-two million, one hundred thousand, twenty-one".