21682492 has 24 divisors (see below), whose sum is σ = 41817776. Its totient is φ = 9773568.

The previous prime is 21682487. The next prime is 21682499. The reversal of 21682492 is 29428612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21682499) 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 7 ways as a sum of consecutive naturals, for example, 2613 + ... + 7084.

Almost surely, 2^21682492 is an apocalyptic number.

It is an amenable number.

21682492 is a deficient number, since it is larger than the sum of its proper divisors (20135284).

21682492 is a wasteful number, since it uses less digits than its factorization.

21682492 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9757 (or 9755 counting only the distinct ones).

The product of its digits is 13824, while the sum is 34.

The square root of 21682492 is about 4656.4462844534. The cubic root of 21682492 is about 278.8494110762.

The spelling of 21682492 in words is "twenty-one million, six hundred eighty-two thousand, four hundred ninety-two".