21474638 has 16 divisors (see below), whose sum is σ = 34219584. Its totient is φ = 10072320.

The previous prime is 21474637. The next prime is 21474641. The reversal of 21474638 is 83647412.

It is a super-2 number, since 2×21474638² = 922320154462088, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21474598 and 21474607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21474637) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11618 + ... + 13338.

It is an arithmetic number, because the mean of its divisors is an integer number (2138724).

Almost surely, 2^21474638 is an apocalyptic number.

21474638 is a deficient number, since it is larger than the sum of its proper divisors (12744946).

21474638 is a wasteful number, since it uses less digits than its factorization.

21474638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2107.

The product of its digits is 32256, while the sum is 35.

The square root of 21474638 is about 4634.0735859501. The cubic root of 21474638 is about 277.9555076045.

The spelling of 21474638 in words is "twenty-one million, four hundred seventy-four thousand, six hundred thirty-eight".