21751361332 has 12 divisors (see below), whose sum is σ = 38783088036. Its totient is φ = 10670479040.

The previous prime is 21751361311. The next prime is 21751361341. The reversal of 21751361332 is 23316315712.

It can be written as a sum of positive squares in 2 ways, for example, as 6810210576 + 14941150756 = 82524^2 + 122234^2 .

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, 51300169 + ... + 51300592.

It is an arithmetic number, because the mean of its divisors is an integer number (3231924003).

Almost surely, 2^21751361332 is an apocalyptic number.

It is an amenable number.

21751361332 is a deficient number, since it is larger than the sum of its proper divisors (17031726704).

21751361332 is a wasteful number, since it uses less digits than its factorization.

21751361332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102600818 (or 102600816 counting only the distinct ones).

The product of its digits is 22680, while the sum is 34.

The spelling of 21751361332 in words is "twenty-one billion, seven hundred fifty-one million, three hundred sixty-one thousand, three hundred thirty-two".