111121212021 has 8 divisors (see below), whose sum is σ = 148166228160. Its totient is φ = 74078501952.

The previous prime is 111121211939. The next prime is 111121212023. The reversal of 111121212021 is 120212121111.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 111121212021 - 2²⁵ = 111087657589 is a prime.

It is a super-2 number, since 2×111121212021² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111121212023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 460761 + ... + 659198.

It is an arithmetic number, because the mean of its divisors is an integer number (18520778520).

Almost surely, 2^111121212021 is an apocalyptic number.

It is an amenable number.

111121212021 is a deficient number, since it is larger than the sum of its proper divisors (37045016139).

111121212021 is a wasteful number, since it uses less digits than its factorization.

111121212021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1153035.

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

Adding to 111121212021 its reverse (120212121111), we get a palindrome (231333333132).

The spelling of 111121212021 in words is "one hundred eleven billion, one hundred twenty-one million, two hundred twelve thousand, twenty-one".