21679480 has 16 divisors (see below), whose sum is σ = 48778920. Its totient is φ = 8671776.

The previous prime is 21679477. The next prime is 21679561. The reversal of 21679480 is 8497612.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 270954 + ... + 271033.

Almost surely, 2^21679480 is an apocalyptic number.

21679480 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21679480 is an abundant number, since it is smaller than the sum of its proper divisors (27099440).

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

21679480 is a wasteful number, since it uses less digits than its factorization.

21679480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 541998 (or 541994 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 21679480 is about 4656.1228506129. The cubic root of 21679480 is about 278.8364984565.

The spelling of 21679480 in words is "twenty-one million, six hundred seventy-nine thousand, four hundred eighty".