21337236021 has 8 divisors (see below), whose sum is σ = 28850347584. Its totient is φ = 14024474240.

The previous prime is 21337236007. The next prime is 21337236043. The reversal of 21337236021 is 12063273312.

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

It is a cyclic number.

It is not a de Polignac number, because 21337236021 - 2⁷ = 21337235893 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21337236021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21337236001) 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 7 ways as a sum of consecutive naturals, for example, 50087196 + ... + 50087621.

It is an arithmetic number, because the mean of its divisors is an integer number (3606293448).

Almost surely, 2^21337236021 is an apocalyptic number.

It is an amenable number.

21337236021 is a deficient number, since it is larger than the sum of its proper divisors (7513111563).

21337236021 is a wasteful number, since it uses less digits than its factorization.

21337236021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100174891.

The product of its (nonzero) digits is 9072, while the sum is 30.

The spelling of 21337236021 in words is "twenty-one billion, three hundred thirty-seven million, two hundred thirty-six thousand, twenty-one".