21079274 has 8 divisors (see below), whose sum is σ = 31778400. Its totient is φ = 10486476.

The previous prime is 21079271. The next prime is 21079297. The reversal of 21079274 is 47297012.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21079274.

It is not an unprimeable number, because it can be changed into a prime (21079271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26084 + ... + 26879.

It is an arithmetic number, because the mean of its divisors is an integer number (3972300).

Almost surely, 2^21079274 is an apocalyptic number.

21079274 is a deficient number, since it is larger than the sum of its proper divisors (10699126).

21079274 is a wasteful number, since it uses less digits than its factorization.

21079274 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53164.

The product of its (nonzero) digits is 7056, while the sum is 32.

The square root of 21079274 is about 4591.2170499771. The cubic root of 21079274 is about 276.2391419604.

The spelling of 21079274 in words is "twenty-one million, seventy-nine thousand, two hundred seventy-four".