21599142 has 16 divisors (see below), whose sum is σ = 44688240. Its totient is φ = 6951392.

The previous prime is 21599117. The next prime is 21599177. The reversal of 21599142 is 24199512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61893 + ... + 62240.

It is an arithmetic number, because the mean of its divisors is an integer number (2793015).

Almost surely, 2^21599142 is an apocalyptic number.

21599142 is an abundant number, since it is smaller than the sum of its proper divisors (23089098).

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

21599142 is a wasteful number, since it uses less digits than its factorization.

21599142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124167.

The product of its digits is 6480, while the sum is 33.

The square root of 21599142 is about 4647.4877084291. The cubic root of 21599142 is about 278.4916424835.

The spelling of 21599142 in words is "twenty-one million, five hundred ninety-nine thousand, one hundred forty-two".