21372851598 has 64 divisors (see below), whose sum is σ = 49851486720. Its totient is φ = 5982337152.

The previous prime is 21372851573. The next prime is 21372851629. The reversal of 21372851598 is 89515827312.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21372851598.

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, 711336 + ... + 740772.

It is an arithmetic number, because the mean of its divisors is an integer number (778929480).

Almost surely, 2^21372851598 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21372851598, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24925743360).

21372851598 is an abundant number, since it is smaller than the sum of its proper divisors (28478635122).

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

21372851598 is a wasteful number, since it uses less digits than its factorization.

21372851598 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29801.

The product of its digits is 1209600, while the sum is 51.

The spelling of 21372851598 in words is "twenty-one billion, three hundred seventy-two million, eight hundred fifty-one thousand, five hundred ninety-eight".