111010100021 has 4 divisors (see below), whose sum is σ = 112891627200. Its totient is φ = 109128572844.

The previous prime is 111010099999. The next prime is 111010100023. The reversal of 111010100021 is 120001010111.

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 a de Polignac number, because none of the positive numbers 2^k-111010100021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111010099981 and 111010100008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111010100023) 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, 940763501 + ... + 940763618.

It is an arithmetic number, because the mean of its divisors is an integer number (28222906800).

Almost surely, 2^111010100021 is an apocalyptic number.

It is an amenable number.

111010100021 is a deficient number, since it is larger than the sum of its proper divisors (1881527179).

111010100021 is an equidigital number, since it uses as much as digits as its factorization.

111010100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1881527178.

The product of its (nonzero) digits is 2, while the sum is 8.

Adding to 111010100021 its reverse (120001010111), we get a palindrome (231011110132).

The spelling of 111010100021 in words is "one hundred eleven billion, ten million, one hundred thousand, twenty-one".