20021022210021 has 16 divisors (see below), whose sum is σ = 30793347915264. Its totient is φ = 11333662771824.

The previous prime is 20021022210017. The next prime is 20021022210037. The reversal of 20021022210021 is 12001222012002.

It is not a de Polignac number, because 20021022210021 - 2² = 20021022210017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021022210001) 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, 4455053875 + ... + 4455058368.

It is an arithmetic number, because the mean of its divisors is an integer number (1924584244704).

Almost surely, 2^{20021022210021} is an apocalyptic number.

20021022210021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20021022210021 is a deficient number, since it is larger than the sum of its proper divisors (10772325705243).

20021022210021 is a wasteful number, since it uses less digits than its factorization.

20021022210021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8910112360.

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

Adding to 20021022210021 its reverse (12001222012002), we get a palindrome (32022244222023).

The spelling of 20021022210021 in words is "twenty trillion, twenty-one billion, twenty-two million, two hundred ten thousand, twenty-one".