21014979 has 8 divisors (see below), whose sum is σ = 28144320. Its totient is φ = 13947816.

The previous prime is 21014963. The next prime is 21014989. The reversal of 21014979 is 97941012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21014979 - 2⁴ = 21014963 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21014989) 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, 14749 + ... + 16110.

It is an arithmetic number, because the mean of its divisors is an integer number (3518040).

Almost surely, 2^21014979 is an apocalyptic number.

21014979 is a deficient number, since it is larger than the sum of its proper divisors (7129341).

21014979 is a wasteful number, since it uses less digits than its factorization.

21014979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31089.

The product of its (nonzero) digits is 4536, while the sum is 33.

The square root of 21014979 is about 4584.2097465103. The cubic root of 21014979 is about 275.9579987546.

The spelling of 21014979 in words is "twenty-one million, fourteen thousand, nine hundred seventy-nine".