20021113021 has 16 divisors (see below), whose sum is σ = 24783825024. Its totient is φ = 15749302464.

The previous prime is 20021113001. The next prime is 20021113037. The reversal of 20021113021 is 12031112002.

It is not a de Polignac number, because 20021113021 - 2²⁷ = 19886895293 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a junction number, because it is equal to n+sod(n) for n = 20021112992 and 20021113010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021113001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 620131 + ... + 651616.

It is an arithmetic number, because the mean of its divisors is an integer number (1548989064).

Almost surely, 2^20021113021 is an apocalyptic number.

It is an amenable number.

20021113021 is a deficient number, since it is larger than the sum of its proper divisors (4762712003).

20021113021 is a wasteful number, since it uses less digits than its factorization.

20021113021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1271940.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 20021113021 its reverse (12031112002), we get a palindrome (32052225023).

The spelling of 20021113021 in words is "twenty billion, twenty-one million, one hundred thirteen thousand, twenty-one".