202011202010021 has 4 divisors (see below), whose sum is σ = 202011439375500. Its totient is φ = 202010964644544.

The previous prime is 202011202010011. The next prime is 202011202010029. The reversal of 202011202010021 is 120010202110202.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 21011579977921 + 180999622032100 = 4583839^2 + 13453610^2 .

It is a cyclic number.

It is not a de Polignac number, because 202011202010021 - 2²² = 202011197815717 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 202011202009978 and 202011202010005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202011202010029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 117401546 + ... + 119109803.

It is an arithmetic number, because the mean of its divisors is an integer number (50502859843875).

Almost surely, 2^{202011202010021} is an apocalyptic number.

It is an amenable number.

202011202010021 is a deficient number, since it is larger than the sum of its proper divisors (237365479).

202011202010021 is an equidigital number, since it uses as much as digits as its factorization.

202011202010021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237365478.

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

Adding to 202011202010021 its reverse (120010202110202), we get a palindrome (322021404120223).

The spelling of 202011202010021 in words is "two hundred two trillion, eleven billion, two hundred two million, ten thousand, twenty-one".