21398173360 has 160 divisors (see below), whose sum is σ = 53912174400. Its totient is φ = 7868350464.

The previous prime is 21398173351. The next prime is 21398173373. The reversal of 21398173360 is 6337189312.

It is a happy number.

It is a super-2 number, since 2×21398173360² (a number of 21 digits) contains 22 as substring.

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, 20398116 + ... + 20399164.

It is an arithmetic number, because the mean of its divisors is an integer number (336951090).

Almost surely, 2^21398173360 is an apocalyptic number.

21398173360 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21398173360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26956087200).

21398173360 is an abundant number, since it is smaller than the sum of its proper divisors (32514001040).

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

21398173360 is a wasteful number, since it uses less digits than its factorization.

21398173360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1415 (or 1409 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 43.

The spelling of 21398173360 in words is "twenty-one billion, three hundred ninety-eight million, one hundred seventy-three thousand, three hundred sixty".