21179016 has 64 divisors (see below), whose sum is σ = 59702400. Its totient is φ = 6955200.

The previous prime is 21179003. The next prime is 21179023. The reversal of 21179016 is 61097112.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14646 + ... + 16026.

It is an arithmetic number, because the mean of its divisors is an integer number (932850).

Almost surely, 2^21179016 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21179016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29851200).

21179016 is an abundant number, since it is smaller than the sum of its proper divisors (38523384).

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

21179016 is a wasteful number, since it uses less digits than its factorization.

21179016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1467 (or 1457 counting only the distinct ones).

The product of its (nonzero) digits is 756, while the sum is 27.

The square root of 21179016 is about 4602.0664923488. The cubic root of 21179016 is about 276.6741553754.

The spelling of 21179016 in words is "twenty-one million, one hundred seventy-nine thousand, sixteen".