21337185493 has 32 divisors (see below), whose sum is σ = 24453273600. Its totient is φ = 18472478976.

The previous prime is 21337185439. The next prime is 21337185511. The reversal of 21337185493 is 39458173312.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21337185493 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 (21337185893) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14827068 + ... + 14828506.

It is an arithmetic number, because the mean of its divisors is an integer number (764164800).

Almost surely, 2^21337185493 is an apocalyptic number.

It is an amenable number.

21337185493 is a deficient number, since it is larger than the sum of its proper divisors (3116088107).

21337185493 is a wasteful number, since it uses less digits than its factorization.

21337185493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2581.

The product of its digits is 544320, while the sum is 46.

The spelling of 21337185493 in words is "twenty-one billion, three hundred thirty-seven million, one hundred eighty-five thousand, four hundred ninety-three".