20021012222021 has 16 divisors (see below), whose sum is σ = 20580816523008. Its totient is φ = 19462198536000.

The previous prime is 20021012221963. The next prime is 20021012222041. The reversal of 20021012222021 is 12022221012002.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20021012222021 - 2²⁶ = 20020945113157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021012222041) 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, 231812996 + ... + 231899346.

It is an arithmetic number, because the mean of its divisors is an integer number (1286301032688).

Almost surely, 2^{20021012222021} is an apocalyptic number.

It is an amenable number.

20021012222021 is a deficient number, since it is larger than the sum of its proper divisors (559804300987).

20021012222021 is a wasteful number, since it uses less digits than its factorization.

20021012222021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92012.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 20021012222021 its reverse (12022221012002), we get a palindrome (32043233234023).

The spelling of 20021012222021 in words is "twenty trillion, twenty-one billion, twelve million, two hundred twenty-two thousand, twenty-one".