21237706144326 has 48 divisors (see below), whose sum is σ = 49965344028720. Its totient is φ = 5999737201920.

The previous prime is 21237706144247. The next prime is 21237706144379. The reversal of 21237706144326 is 62344160773212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 405800215 + ... + 405852546.

It is an arithmetic number, because the mean of its divisors is an integer number (1040944667265).

Almost surely, 2^{21237706144326} is an apocalyptic number.

21237706144326 is an abundant number, since it is smaller than the sum of its proper divisors (28727637884394).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21237706144326 is a wasteful number, since it uses less digits than its factorization.

21237706144326 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 811652869 (or 811652862 counting only the distinct ones).

The product of its (nonzero) digits is 2032128, while the sum is 48.

The spelling of 21237706144326 in words is "twenty-one trillion, two hundred thirty-seven billion, seven hundred six million, one hundred forty-four thousand, three hundred twenty-six".