21537415224737 has 8 divisors (see below), whose sum is σ = 22672566658560. Its totient is φ = 20402424117360.

The previous prime is 21537415224683. The next prime is 21537415224739. The reversal of 21537415224737 is 73742251473512.

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 21537415224737 - 2¹⁸ = 21537414962593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21537415224739) 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, 39805814 + ... + 40343247.

It is an arithmetic number, because the mean of its divisors is an integer number (2834070832320).

Almost surely, 2^{21537415224737} is an apocalyptic number.

It is an amenable number.

21537415224737 is a deficient number, since it is larger than the sum of its proper divisors (1135151433823).

21537415224737 is a wasteful number, since it uses less digits than its factorization.

21537415224737 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80163223.

The product of its digits is 9878400, while the sum is 53.

The spelling of 21537415224737 in words is "twenty-one trillion, five hundred thirty-seven billion, four hundred fifteen million, two hundred twenty-four thousand, seven hundred thirty-seven".