21079079 has 16 divisors (see below), whose sum is σ = 24600576. Its totient is φ = 17690400.

The previous prime is 21079067. The next prime is 21079081. The reversal of 21079079 is 97097012.

It is not a de Polignac number, because 21079079 - 2¹⁶ = 21013543 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21079879) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 116369 + ... + 116549.

It is an arithmetic number, because the mean of its divisors is an integer number (1537536).

Almost surely, 2^21079079 is an apocalyptic number.

21079079 is a deficient number, since it is larger than the sum of its proper divisors (3521497).

21079079 is a wasteful number, since it uses less digits than its factorization.

21079079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 446.

The product of its (nonzero) digits is 7938, while the sum is 35.

The square root of 21079079 is about 4591.1958137287. The cubic root of 21079079 is about 276.2382901474.

The spelling of 21079079 in words is "twenty-one million, seventy-nine thousand, seventy-nine".