111210102010021 has 4 divisors (see below), whose sum is σ = 127097259440032. Its totient is φ = 95322944580012.

The previous prime is 111210102009991. The next prime is 111210102010037. The reversal of 111210102010021 is 120010201012111.

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 not a de Polignac number, because 111210102010021 - 2⁷ = 111210102009893 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 111210102009983 and 111210102010010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111210162010021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7943578714995 + ... + 7943578715008.

It is an arithmetic number, because the mean of its divisors is an integer number (31774314860008).

Almost surely, 2^{111210102010021} is an apocalyptic number.

It is an amenable number.

111210102010021 is a deficient number, since it is larger than the sum of its proper divisors (15887157430011).

111210102010021 is an equidigital number, since it uses as much as digits as its factorization.

111210102010021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15887157430010.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 111210102010021 its reverse (120010201012111), we get a palindrome (231220303022132).

The spelling of 111210102010021 in words is "one hundred eleven trillion, two hundred ten billion, one hundred two million, ten thousand, twenty-one".