111021212010021 has 16 divisors (see below), whose sum is σ = 154518474232320. Its totient is φ = 70771303033200.

The previous prime is 111021212010011. The next prime is 111021212010077. The reversal of 111021212010021 is 120010212120111.

It is a happy number.

It is not a de Polignac number, because 111021212010021 - 2²⁵ = 111021178455589 is a prime.

It is a super-2 number, since 2×111021212010021² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111021212010011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 281985511 + ... + 282378948.

It is an arithmetic number, because the mean of its divisors is an integer number (9657404639520).

Almost surely, 2^{111021212010021} is an apocalyptic number.

It is an amenable number.

111021212010021 is a deficient number, since it is larger than the sum of its proper divisors (43497262222299).

111021212010021 is a wasteful number, since it uses less digits than its factorization.

111021212010021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 564367336.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 111021212010021 its reverse (120010212120111), we get a palindrome (231031424130132).

The spelling of 111021212010021 in words is "one hundred eleven trillion, twenty-one billion, two hundred twelve million, ten thousand, twenty-one".