21398362758072 has 96 divisors (see below), whose sum is σ = 58689410457600. Its totient is φ = 7042269019968.

The previous prime is 21398362758013. The next prime is 21398362758079. The reversal of 21398362758072 is 27085726389312.

21398362758072 is a `hidden beast` number, since 2 + 1 + 398 + 36 + 2 + 75 + 80 + 72 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21398362758079) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 327044353 + ... + 327109775.

It is an arithmetic number, because the mean of its divisors is an integer number (611348025600).

Almost surely, 2^{21398362758072} is an apocalyptic number.

It is an amenable number.

21398362758072 is an abundant number, since it is smaller than the sum of its proper divisors (37291047699528).

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

21398362758072 is a wasteful number, since it uses less digits than its factorization.

21398362758072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123017 (or 123010 counting only the distinct ones).

The product of its (nonzero) digits is 60963840, while the sum is 63.

The spelling of 21398362758072 in words is "twenty-one trillion, three hundred ninety-eight billion, three hundred sixty-two million, seven hundred fifty-eight thousand, seventy-two".