20333051621 has 16 divisors (see below), whose sum is σ = 21149119488. Its totient is φ = 19527264000.

The previous prime is 20333051597. The next prime is 20333051701. The reversal of 20333051621 is 12615033302.

It is a cyclic number.

It is not a de Polignac number, because 20333051621 - 2²² = 20328857317 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20333041621) 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 15 ways as a sum of consecutive naturals, for example, 7268195 + ... + 7270991.

It is an arithmetic number, because the mean of its divisors is an integer number (1321819968).

Almost surely, 2^20333051621 is an apocalyptic number.

It is an amenable number.

20333051621 is a deficient number, since it is larger than the sum of its proper divisors (816067867).

20333051621 is a wasteful number, since it uses less digits than its factorization.

20333051621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4532.

The product of its (nonzero) digits is 3240, while the sum is 26.

Adding to 20333051621 its reverse (12615033302), we get a palindrome (32948084923).

The spelling of 20333051621 in words is "twenty billion, three hundred thirty-three million, fifty-one thousand, six hundred twenty-one".