21546154312 has 16 divisors (see below), whose sum is σ = 40518922860. Its totient is φ = 10741108224.

The previous prime is 21546154309. The next prime is 21546154411. The reversal of 21546154312 is 21345164512.

It can be written as a sum of positive squares in 2 ways, for example, as 20628427876 + 917726436 = 143626^2 + 30294^2 .

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, 3993253 + ... + 3998644.

Almost surely, 2^21546154312 is an apocalyptic number.

It is an amenable number.

21546154312 is a deficient number, since it is larger than the sum of its proper divisors (18972768548).

21546154312 is a wasteful number, since it uses less digits than its factorization.

21546154312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7992240 (or 7992236 counting only the distinct ones).

The product of its digits is 28800, while the sum is 34.

The spelling of 21546154312 in words is "twenty-one billion, five hundred forty-six million, one hundred fifty-four thousand, three hundred twelve".