210221022000021 has 16 divisors (see below), whose sum is σ = 280800441621504. Its totient is φ = 139894479713984.

The previous prime is 210221021999999. The next prime is 210221022000071. The reversal of 210221022000021 is 120000220122012.

It is a cyclic number.

It is not a de Polignac number, because 210221022000021 - 2²² = 210221017805717 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210221022000071) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 208567756 + ... + 209573258.

It is an arithmetic number, because the mean of its divisors is an integer number (17550027601344).

Almost surely, 2^{210221022000021} is an apocalyptic number.

It is an amenable number.

210221022000021 is a deficient number, since it is larger than the sum of its proper divisors (70579419621483).

210221022000021 is a wasteful number, since it uses less digits than its factorization.

210221022000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1131180.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 210221022000021 its reverse (120000220122012), we get a palindrome (330221242122033).

The spelling of 210221022000021 in words is "two hundred ten trillion, two hundred twenty-one billion, twenty-two million, twenty-one", and thus it is an aban number.