20833518921 has 8 divisors (see below), whose sum is σ = 29412026784. Its totient is φ = 13072011840.

The previous prime is 20833518919. The next prime is 20833518941. The reversal of 20833518921 is 12981533802.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20833518921 - 2¹ = 20833518919 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20833518911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 204250135 + ... + 204250236.

It is an arithmetic number, because the mean of its divisors is an integer number (3676503348).

Almost surely, 2^20833518921 is an apocalyptic number.

It is an amenable number.

20833518921 is a deficient number, since it is larger than the sum of its proper divisors (8578507863).

20833518921 is a wasteful number, since it uses less digits than its factorization.

20833518921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408500391.

The product of its (nonzero) digits is 103680, while the sum is 42.

The spelling of 20833518921 in words is "twenty billion, eight hundred thirty-three million, five hundred eighteen thousand, nine hundred twenty-one".