21679080 has 64 divisors (see below), whose sum is σ = 68869440. Its totient is φ = 5440512.

The previous prime is 21679051. The next prime is 21679081. The reversal of 21679080 is 8097612.

It is not an unprimeable number, because it can be changed into a prime (21679081) 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 15 ways as a sum of consecutive naturals, for example, 3274 + ... + 7353.

It is an arithmetic number, because the mean of its divisors is an integer number (1076085).

Almost surely, 2^21679080 is an apocalyptic number.

21679080 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21679080 is an abundant number, since it is smaller than the sum of its proper divisors (47190360).

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

21679080 is a wasteful number, since it uses less digits than its factorization.

21679080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10658 (or 10654 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 33.

The square root of 21679080 is about 4656.0798962217. The cubic root of 21679080 is about 278.8347835432.

The spelling of 21679080 in words is "twenty-one million, six hundred seventy-nine thousand, eighty".