21154541432 has 16 divisors (see below), whose sum is σ = 40073681760. Its totient is φ = 10468226304.

The previous prime is 21154541399. The next prime is 21154541449. The reversal of 21154541432 is 23414545112.

It is a super-2 number, since 2×21154541432² (a number of 21 digits) contains 22 as substring.

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, 13629728 + ... + 13631279.

It is an arithmetic number, because the mean of its divisors is an integer number (2504605110).

Almost surely, 2^21154541432 is an apocalyptic number.

It is an amenable number.

21154541432 is a deficient number, since it is larger than the sum of its proper divisors (18919140328).

21154541432 is a wasteful number, since it uses less digits than its factorization.

21154541432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27261110 (or 27261106 counting only the distinct ones).

The product of its digits is 19200, while the sum is 32.

The spelling of 21154541432 in words is "twenty-one billion, one hundred fifty-four million, five hundred forty-one thousand, four hundred thirty-two".