102012100021 has 8 divisors (see below), whose sum is σ = 109872314720. Its totient is φ = 94153761072.

The previous prime is 102012099953. The next prime is 102012100027. The reversal of 102012100021 is 120001210201.

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

It is a cyclic number.

It is not a de Polignac number, because 102012100021 - 2¹⁵ = 102012067253 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102012099980 and 102012100007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102012100027) 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 7 ways as a sum of consecutive naturals, for example, 354951 + ... + 574468.

It is an arithmetic number, because the mean of its divisors is an integer number (13734039340).

Almost surely, 2^102012100021 is an apocalyptic number.

It is an amenable number.

102012100021 is a deficient number, since it is larger than the sum of its proper divisors (7860214699).

102012100021 is an equidigital number, since it uses as much as digits as its factorization.

102012100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 937875.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 102012100021 its reverse (120001210201), we get a palindrome (222013310222).

The spelling of 102012100021 in words is "one hundred two billion, twelve million, one hundred thousand, twenty-one".