1111010021221 has 4 divisors (see below), whose sum is σ = 1111012246432. Its totient is φ = 1111007796012.

The previous prime is 1111010021201. The next prime is 1111010021279. The reversal of 1111010021221 is 1221200101111.

It is a happy number.

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 not a de Polignac number, because 1111010021221 - 2⁵ = 1111010021189 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 (1111010021201) 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, 22000 + ... + 1490806.

It is an arithmetic number, because the mean of its divisors is an integer number (277753061608).

Almost surely, 2^{1111010021221} is an apocalyptic number.

It is an amenable number.

1111010021221 is a deficient number, since it is larger than the sum of its proper divisors (2225211).

1111010021221 is an equidigital number, since it uses as much as digits as its factorization.

1111010021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2225210.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 1111010021221 its reverse (1221200101111), we get a palindrome (2332210122332).

The spelling of 1111010021221 in words is "one trillion, one hundred eleven billion, ten million, twenty-one thousand, two hundred twenty-one".