21371598 has 12 divisors (see below), whose sum is σ = 46305168. Its totient is φ = 7123860.

The previous prime is 21371591. The next prime is 21371627. The reversal of 21371598 is 89517312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21371591) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 593638 + ... + 593673.

It is an arithmetic number, because the mean of its divisors is an integer number (3858764).

Almost surely, 2^21371598 is an apocalyptic number.

21371598 is an abundant number, since it is smaller than the sum of its proper divisors (24933570).

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

21371598 is a wasteful number, since it uses less digits than its factorization.

21371598 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1187319 (or 1187316 counting only the distinct ones).

The product of its digits is 15120, while the sum is 36.

The square root of 21371598 is about 4622.9425694032. The cubic root of 21371598 is about 277.5102309352.

The spelling of 21371598 in words is "twenty-one million, three hundred seventy-one thousand, five hundred ninety-eight".