21682488 has 32 divisors (see below), whose sum is σ = 56077200. Its totient is φ = 6978048.

The previous prime is 21682487. The next prime is 21682499. The reversal of 21682488 is 88428612.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21682487) 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, 14881 + ... + 16272.

Almost surely, 2^21682488 is an apocalyptic number.

It is an amenable number.

21682488 is an abundant number, since it is smaller than the sum of its proper divisors (34394712).

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

21682488 is a wasteful number, since it uses less digits than its factorization.

21682488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31191 (or 31187 counting only the distinct ones).

The product of its digits is 49152, while the sum is 39.

The square root of 21682488 is about 4656.4458549413. The cubic root of 21682488 is about 278.8493939288.

It can be divided in two parts, 2168 and 2488, that added together give a triangular number (4656 = T₉₆).

The spelling of 21682488 in words is "twenty-one million, six hundred eighty-two thousand, four hundred eighty-eight".