111212010021 has 32 divisors (see below), whose sum is σ = 170661427200. Its totient is φ = 63101699136.

The previous prime is 111212009981. The next prime is 111212010029. The reversal of 111212010021 is 120010212111.

It is not a de Polignac number, because 111212010021 - 2⁹ = 111212009509 is a prime.

It is a super-2 number, since 2×111212010021² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 111212009979 and 111212010006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111212010029) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15600760 + ... + 15607886.

It is an arithmetic number, because the mean of its divisors is an integer number (5333169600).

Almost surely, 2^111212010021 is an apocalyptic number.

It is an amenable number.

111212010021 is a deficient number, since it is larger than the sum of its proper divisors (59449417179).

111212010021 is a wasteful number, since it uses less digits than its factorization.

111212010021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12273.

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

Adding to 111212010021 its reverse (120010212111), we get a palindrome (231222222132).

The spelling of 111212010021 in words is "one hundred eleven billion, two hundred twelve million, ten thousand, twenty-one".