21594042 has 24 divisors (see below), whose sum is σ = 48297600. Its totient is φ = 6965640.

The previous prime is 21594031. The next prime is 21594047. The reversal of 21594042 is 24049512.

It is a junction number, because it is equal to n+sod(n) for n = 21593997 and 21594015.

It is not an unprimeable number, because it can be changed into a prime (21594047) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18792 + ... + 19907.

It is an arithmetic number, because the mean of its divisors is an integer number (2012400).

Almost surely, 2^21594042 is an apocalyptic number.

21594042 is an abundant number, since it is smaller than the sum of its proper divisors (26703558).

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

21594042 is a wasteful number, since it uses less digits than its factorization.

21594042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38738 (or 38735 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 21594042 is about 4646.9389924982. The cubic root of 21594042 is about 278.4697215637.

The spelling of 21594042 in words is "twenty-one million, five hundred ninety-four thousand, forty-two".