202012100102021 has 4 divisors (see below), whose sum is σ = 220376836474944. Its totient is φ = 183647363729100.

The previous prime is 202012100101961. The next prime is 202012100102041. The reversal of 202012100102021 is 120201001210202.

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 202012100102021 - 2⁴² = 197614053590917 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 202012100101987 and 202012100102005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202012100102041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9182368186445 + ... + 9182368186466.

It is an arithmetic number, because the mean of its divisors is an integer number (55094209118736).

Almost surely, 2^{202012100102021} is an apocalyptic number.

It is an amenable number.

202012100102021 is a deficient number, since it is larger than the sum of its proper divisors (18364736372923).

202012100102021 is a wasteful number, since it uses less digits than its factorization.

202012100102021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18364736372922.

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

Adding to 202012100102021 its reverse (120201001210202), we get a palindrome (322213101312223).

The spelling of 202012100102021 in words is "two hundred two trillion, twelve billion, one hundred million, one hundred two thousand, twenty-one".