202102012100021 has 8 divisors (see below), whose sum is σ = 221389755996288. Its totient is φ = 182966740488000.

The previous prime is 202102012100017. The next prime is 202102012100041. The reversal of 202102012100021 is 120001210201202.

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 202102012100021 - 2² = 202102012100017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 202102012099969 and 202102012100005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202102012100041) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38118068285 + ... + 38118073586.

It is an arithmetic number, because the mean of its divisors is an integer number (27673719499536).

Almost surely, 2^{202102012100021} is an apocalyptic number.

It is an amenable number.

202102012100021 is a deficient number, since it is larger than the sum of its proper divisors (19287743896267).

202102012100021 is a wasteful number, since it uses less digits than its factorization.

202102012100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76236142123.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 202102012100021 its reverse (120001210201202), we get a palindrome (322103222301223).

The spelling of 202102012100021 in words is "two hundred two trillion, one hundred two billion, twelve million, one hundred thousand, twenty-one".