21240592 has 20 divisors (see below), whose sum is σ = 42943680. Its totient is φ = 10158368.

The previous prime is 21240587. The next prime is 21240631. The reversal of 21240592 is 29504212.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28492 + ... + 29227.

It is an arithmetic number, because the mean of its divisors is an integer number (2147184).

Almost surely, 2^21240592 is an apocalyptic number.

It is an amenable number.

21240592 is an abundant number, since it is smaller than the sum of its proper divisors (21703088).

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

21240592 is a wasteful number, since it uses less digits than its factorization.

21240592 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57750 (or 57744 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 21240592 is about 4608.7516748031. The cubic root of 21240592 is about 276.9420306432.

It can be divided in two parts, 212 and 40592, that added together give a palindrome (40804).

The spelling of 21240592 in words is "twenty-one million, two hundred forty thousand, five hundred ninety-two".