202000000100021 has 4 divisors (see below), whose sum is σ = 202025508379200. Its totient is φ = 201974491820844.

The previous prime is 202000000100011. The next prime is 202000000100047. The reversal of 202000000100021 is 120001000000202.

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 202000000100021 - 2¹⁸ = 201999999837877 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 202000000099981 and 202000000100008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202000000100011) 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, 12754127711 + ... + 12754143548.

It is an arithmetic number, because the mean of its divisors is an integer number (50506377094800).

Almost surely, 2^{202000000100021} is an apocalyptic number.

It is an amenable number.

202000000100021 is a deficient number, since it is larger than the sum of its proper divisors (25508279179).

202000000100021 is an equidigital number, since it uses as much as digits as its factorization.

202000000100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25508279178.

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

Adding to 202000000100021 its reverse (120001000000202), we get a palindrome (322001000100223).

The spelling of 202000000100021 in words is "two hundred two trillion, one hundred thousand, twenty-one".