21354845312 has 32 divisors (see below), whose sum is σ = 42964098300. Its totient is φ = 10571699200.

The previous prime is 21354845269. The next prime is 21354845357.

21354845312 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 2 ways, for example, as 19192223296 + 2162622016 = 138536^2 + 46504^2 .

It is a tau number, because it is divible by the number of its divisors (32).

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, 812987 + ... + 838842.

Almost surely, 2^21354845312 is an apocalyptic number.

It is an amenable number.

21354845312 is an abundant number, since it is smaller than the sum of its proper divisors (21609252988).

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

21354845312 is a wasteful number, since it uses less digits than its factorization.

21354845312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1651944 (or 1651932 counting only the distinct ones).

The product of its digits is 115200, while the sum is 38.

The spelling of 21354845312 in words is "twenty-one billion, three hundred fifty-four million, eight hundred forty-five thousand, three hundred twelve".