21079242 has 12 divisors (see below), whose sum is σ = 45671730. Its totient is φ = 7026408.

The previous prime is 21079237. The next prime is 21079243. The reversal of 21079242 is 24297012.

It can be written as a sum of positive squares in only one way, i.e., 18326961 + 2752281 = 4281^2 + 1659^2 .

It is not an unprimeable number, because it can be changed into a prime (21079243) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 585517 + ... + 585552.

Almost surely, 2^21079242 is an apocalyptic number.

21079242 is an abundant number, since it is smaller than the sum of its proper divisors (24592488).

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

21079242 is a wasteful number, since it uses less digits than its factorization.

21079242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1171077 (or 1171074 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 21079242 is about 4591.2135650610. The cubic root of 21079242 is about 276.2390021761.

It can be divided in two parts, 21079 and 242, that added together give a triangular number (21321 = T₂₀₆).

The spelling of 21079242 in words is "twenty-one million, seventy-nine thousand, two hundred forty-two".