21894024 has 16 divisors (see below), whose sum is σ = 54735120. Its totient is φ = 7298000.

The previous prime is 21894017. The next prime is 21894031. The reversal of 21894024 is 42049812.

It is an interprime number because it is at equal distance from previous prime (21894017) and next prime (21894031).

It is a junction number, because it is equal to n+sod(n) for n = 21893982 and 21894000.

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, 456102 + ... + 456149.

It is an arithmetic number, because the mean of its divisors is an integer number (3420945).

Almost surely, 2^21894024 is an apocalyptic number.

21894024 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21894024 is an abundant number, since it is smaller than the sum of its proper divisors (32841096).

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

21894024 is a wasteful number, since it uses less digits than its factorization.

21894024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 912260 (or 912256 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 21894024 is about 4679.1050426337. The cubic root of 21894024 is about 279.7532860804.

The spelling of 21894024 in words is "twenty-one million, eight hundred ninety-four thousand, twenty-four".