21326238772 has 12 divisors (see below), whose sum is σ = 37394243460. Its totient is φ = 10642169216.

The previous prime is 21326238721. The next prime is 21326238811. The reversal of 21326238772 is 27783262312.

It can be written as a sum of positive squares in 2 ways, for example, as 6117429796 + 15208808976 = 78214^2 + 123324^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5235253 + ... + 5239324.

It is an arithmetic number, because the mean of its divisors is an integer number (3116186955).

Almost surely, 2^21326238772 is an apocalyptic number.

It is an amenable number.

21326238772 is a deficient number, since it is larger than the sum of its proper divisors (16068004688).

21326238772 is a wasteful number, since it uses less digits than its factorization.

21326238772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10475090 (or 10475088 counting only the distinct ones).

The product of its digits is 338688, while the sum is 43.

The spelling of 21326238772 in words is "twenty-one billion, three hundred twenty-six million, two hundred thirty-eight thousand, seven hundred seventy-two".