21457475412 has 96 divisors (see below), whose sum is σ = 54408017664. Its totient is φ = 6556723200.

The previous prime is 21457475407. The next prime is 21457475467.

21457475412 is nontrivially palindromic in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1273362 + ... + 1290102.

It is an arithmetic number, because the mean of its divisors is an integer number (566750184).

Almost surely, 2^21457475412 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21457475412, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27204008832).

21457475412 is an abundant number, since it is smaller than the sum of its proper divisors (32950542252).

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

21457475412 is a wasteful number, since it uses less digits than its factorization.

21457475412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16929 (or 16927 counting only the distinct ones).

The product of its digits is 313600, while the sum is 42.

The spelling of 21457475412 in words is "twenty-one billion, four hundred fifty-seven million, four hundred seventy-five thousand, four hundred twelve".