21679076 has 12 divisors (see below), whose sum is σ = 39935280. Its totient is φ = 10269000.

The previous prime is 21679051. The next prime is 21679081. The reversal of 21679076 is 67097612.

It is a Harshad number since it is a multiple of its sum of digits (38).

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, 142550 + ... + 142701.

It is an arithmetic number, because the mean of its divisors is an integer number (3327940).

Almost surely, 2^21679076 is an apocalyptic number.

It is an amenable number.

21679076 is a deficient number, since it is larger than the sum of its proper divisors (18256204).

21679076 is a wasteful number, since it uses less digits than its factorization.

21679076 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285274 (or 285272 counting only the distinct ones).

The product of its (nonzero) digits is 31752, while the sum is 38.

The square root of 21679076 is about 4656.0794666758. The cubic root of 21679076 is about 278.8347663940.

The spelling of 21679076 in words is "twenty-one million, six hundred seventy-nine thousand, seventy-six".