21474642 has 24 divisors (see below), whose sum is σ = 49962096. Its totient is φ = 6135528.

The previous prime is 21474641. The next prime is 21474647. The reversal of 21474642 is 24647412.

It is a super-2 number, since 2×21474642² = 922320498056328, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21474641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 36228 + ... + 36815.

It is an arithmetic number, because the mean of its divisors is an integer number (2081754).

Almost surely, 2^21474642 is an apocalyptic number.

21474642 is an abundant number, since it is smaller than the sum of its proper divisors (28487454).

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

21474642 is a wasteful number, since it uses less digits than its factorization.

21474642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73062 (or 73055 counting only the distinct ones).

The product of its digits is 10752, while the sum is 30.

The square root of 21474642 is about 4634.0740175358. The cubic root of 21474642 is about 277.9555248624.

The spelling of 21474642 in words is "twenty-one million, four hundred seventy-four thousand, six hundred forty-two".