20042362921 has 16 divisors (see below), whose sum is σ = 23379477120. Its totient is φ = 16827338880.

The previous prime is 20042362913. The next prime is 20042362969. The reversal of 20042362921 is 12926324002.

It is a cyclic number.

It is not a de Polignac number, because 20042362921 - 2³ = 20042362913 is a prime.

It is a super-2 number, since 2×20042362921² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20042362121) 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, 83670 + ... + 216991.

It is an arithmetic number, because the mean of its divisors is an integer number (1461217320).

Almost surely, 2^20042362921 is an apocalyptic number.

It is an amenable number.

20042362921 is a deficient number, since it is larger than the sum of its proper divisors (3337114199).

20042362921 is a wasteful number, since it uses less digits than its factorization.

20042362921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 300864.

The product of its (nonzero) digits is 10368, while the sum is 31.

Adding to 20042362921 its reverse (12926324002), we get a palindrome (32968686923).

The spelling of 20042362921 in words is "twenty billion, forty-two million, three hundred sixty-two thousand, nine hundred twenty-one".