20133566621 has 8 divisors (see below), whose sum is σ = 23752041984. Its totient is φ = 16700654160.

The previous prime is 20133566591. The next prime is 20133566623. The reversal of 20133566621 is 12666533102.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20133566621 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 (20133566623) 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, 46390490 + ... + 46390923.

It is an arithmetic number, because the mean of its divisors is an integer number (2969005248).

Almost surely, 2^20133566621 is an apocalyptic number.

It is an amenable number.

20133566621 is a deficient number, since it is larger than the sum of its proper divisors (3618475363).

20133566621 is an equidigital number, since it uses as much as digits as its factorization.

20133566621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92781451.

The product of its (nonzero) digits is 38880, while the sum is 35.

The spelling of 20133566621 in words is "twenty billion, one hundred thirty-three million, five hundred sixty-six thousand, six hundred twenty-one".