21325802472 has 384 divisors, whose sum is σ = 67394396160. Its totient is φ = 6273365760.

The previous prime is 21325802447. The next prime is 21325802479. The reversal of 21325802472 is 27420852312.

21325802472 is a `hidden beast` number, since 2 + 1 + 3 + 2 + 580 + 2 + 4 + 72 = 666.

It is a super-2 number, since 2×21325802472² (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 not an unprimeable number, because it can be changed into a prime (21325802479) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 127699333 + ... + 127699499.

It is an arithmetic number, because the mean of its divisors is an integer number (175506240).

Almost surely, 2^21325802472 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 21325802472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33697198080).

21325802472 is an abundant number, since it is smaller than the sum of its proper divisors (46068593688).

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

21325802472 is a wasteful number, since it uses less digits than its factorization.

21325802472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 395 (or 379 counting only the distinct ones).

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

The spelling of 21325802472 in words is "twenty-one billion, three hundred twenty-five million, eight hundred two thousand, four hundred seventy-two".