21470464512 has 480 divisors, whose sum is σ = 76066024320. Its totient is φ = 5693276160.

The previous prime is 21470464481. The next prime is 21470464513. The reversal of 21470464512 is 21546407412.

21470464512 is a `hidden beast` number, since 2 + 1 + 4 + 7 + 0 + 4 + 645 + 1 + 2 = 666.

It is a super-2 number, since 2×21470464512² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21470464513) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 32481462 + ... + 32482122.

It is an arithmetic number, because the mean of its divisors is an integer number (158470884).

Almost surely, 2^21470464512 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 21470464512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38033012160).

21470464512 is an abundant number, since it is smaller than the sum of its proper divisors (54595559808).

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

21470464512 is a wasteful number, since it uses less digits than its factorization.

21470464512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 764 (or 745 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 36.

The spelling of 21470464512 in words is "twenty-one billion, four hundred seventy million, four hundred sixty-four thousand, five hundred twelve".