21751754832 has 30 divisors (see below), whose sum is σ = 60874703162. Its totient is φ = 7250584896.

The previous prime is 21751754807. The next prime is 21751754839. The reversal of 21751754832 is 23845715712.

21751754832 is a `hidden beast` number, since 2 + 1 + 7 + 517 + 54 + 83 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 21669017616 + 82737216 = 147204^2 + 9096^2 .

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21751754839) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 75526783 + ... + 75527070.

Almost surely, 2^21751754832 is an apocalyptic number.

It is an amenable number.

21751754832 is an abundant number, since it is smaller than the sum of its proper divisors (39122948330).

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

21751754832 is a wasteful number, since it uses less digits than its factorization.

21751754832 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151053867 (or 151053858 counting only the distinct ones).

The product of its digits is 470400, while the sum is 45.

The spelling of 21751754832 in words is "twenty-one billion, seven hundred fifty-one million, seven hundred fifty-four thousand, eight hundred thirty-two".