212102010021 has 16 divisors (see below), whose sum is σ = 308800664640. Its totient is φ = 128426401920.

The previous prime is 212102010007. The next prime is 212102010089. The reversal of 212102010021 is 120010201212.

It is a de Polignac number, because none of the positive numbers 2^k-212102010021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 212102009979 and 212102010006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212102010221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2970960 + ... + 3041513.

It is an arithmetic number, because the mean of its divisors is an integer number (19300041540).

Almost surely, 2^212102010021 is an apocalyptic number.

It is an amenable number.

212102010021 is a deficient number, since it is larger than the sum of its proper divisors (96698654619).

212102010021 is a wasteful number, since it uses less digits than its factorization.

212102010021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6013556.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 212102010021 its reverse (120010201212), we get a palindrome (332112211233).

The spelling of 212102010021 in words is "two hundred twelve billion, one hundred two million, ten thousand, twenty-one".