20002122021 has 32 divisors (see below), whose sum is σ = 32319433728. Its totient is φ = 10741743360.

The previous prime is 20002121999. The next prime is 20002122053. The reversal of 20002122021 is 12022120002.

It is not a de Polignac number, because 20002122021 - 2¹⁵ = 20002089253 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20002121988 and 20002122006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20002122061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 206146 + ... + 287228.

It is an arithmetic number, because the mean of its divisors is an integer number (1009982304).

Almost surely, 2^20002122021 is an apocalyptic number.

20002122021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20002122021 is a deficient number, since it is larger than the sum of its proper divisors (12317311707).

20002122021 is a wasteful number, since it uses less digits than its factorization.

20002122021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81801.

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 20002122021 its reverse (12022120002), we get a palindrome (32024242023).

The spelling of 20002122021 in words is "twenty billion, two million, one hundred twenty-two thousand, twenty-one".