20102020120021 has 32 divisors (see below), whose sum is σ = 23242507142400. Its totient is φ = 17030159331840.

The previous prime is 20102020120001. The next prime is 20102020120037. The reversal of 20102020120021 is 12002102020102.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20102020120021 - 2⁹ = 20102020119509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20102020119983 and 20102020120010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20102020120001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 165030486 + ... + 165152248.

It is an arithmetic number, because the mean of its divisors is an integer number (726328348200).

Almost surely, 2^{20102020120021} is an apocalyptic number.

It is an amenable number.

20102020120021 is a deficient number, since it is larger than the sum of its proper divisors (3140487022379).

20102020120021 is a wasteful number, since it uses less digits than its factorization.

20102020120021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122749.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 20102020120021 its reverse (12002102020102), we get a palindrome (32104122140123).

The spelling of 20102020120021 in words is "twenty trillion, one hundred two billion, twenty million, one hundred twenty thousand, twenty-one".