111012000021 has 12 divisors (see below), whose sum is σ = 172685333548. Its totient is φ = 68315076864.

The previous prime is 111012000007. The next prime is 111012000023. The reversal of 111012000021 is 120000210111.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 30831848100 + 80180151921 = 175590^2 + 283161^2 .

It is not a de Polignac number, because 111012000021 - 2¹³ = 111011991829 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 111011999967 and 111012000012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111012000023) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 474410140 + ... + 474410373.

Almost surely, 2^111012000021 is an apocalyptic number.

It is an amenable number.

111012000021 is a deficient number, since it is larger than the sum of its proper divisors (61673333527).

111012000021 is a wasteful number, since it uses less digits than its factorization.

111012000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 948820532 (or 948820529 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 111012000021 its reverse (120000210111), we get a palindrome (231012210132).

The spelling of 111012000021 in words is "one hundred eleven billion, twelve million, twenty-one", and thus it is an aban number.