2002121100021 has 32 divisors (see below), whose sum is σ = 3230440012800. Its totient is φ = 1076728686336.

The previous prime is 2002121099999. The next prime is 2002121100029. The reversal of 2002121100021 is 1200011212002.

It is not a de Polignac number, because 2002121100021 - 2¹⁸ = 2002120837877 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2002121100029) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10381330 + ... + 10572428.

It is an arithmetic number, because the mean of its divisors is an integer number (100951250400).

Almost surely, 2^{2002121100021} is an apocalyptic number.

2002121100021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2002121100021 is a deficient number, since it is larger than the sum of its proper divisors (1228318912779).

2002121100021 is a wasteful number, since it uses less digits than its factorization.

2002121100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220473.

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

Adding to 2002121100021 its reverse (1200011212002), we get a palindrome (3202132312023).

The spelling of 2002121100021 in words is "two trillion, two billion, one hundred twenty-one million, one hundred thousand, twenty-one".