21682628 has 24 divisors (see below), whose sum is σ = 41640480. Its totient is φ = 9797120.

The previous prime is 21682627. The next prime is 21682643. The reversal of 21682628 is 82628612.

It is not an unprimeable number, because it can be changed into a prime (21682627) 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, 6500 + ... + 9252.

It is an arithmetic number, because the mean of its divisors is an integer number (1735020).

Almost surely, 2^21682628 is an apocalyptic number.

It is an amenable number.

21682628 is a deficient number, since it is larger than the sum of its proper divisors (19957852).

21682628 is a wasteful number, since it uses less digits than its factorization.

21682628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2947 (or 2945 counting only the distinct ones).

The product of its digits is 18432, while the sum is 35.

The square root of 21682628 is about 4656.4608878418. The cubic root of 21682628 is about 278.8499940879.

The spelling of 21682628 in words is "twenty-one million, six hundred eighty-two thousand, six hundred twenty-eight".