21079236 has 24 divisors (see below), whose sum is σ = 49272160. Its totient is φ = 7013952.

The previous prime is 21079181. The next prime is 21079237. The reversal of 21079236 is 63297012.

It is not an unprimeable number, because it can be changed into a prime (21079237) 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, 7680 + ... + 10056.

Almost surely, 2^21079236 is an apocalyptic number.

It is an amenable number.

21079236 is an abundant number, since it is smaller than the sum of its proper divisors (28192924).

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

21079236 is a wasteful number, since it uses less digits than its factorization.

21079236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3123 (or 3121 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 30.

The square root of 21079236 is about 4591.2129116389. The cubic root of 21079236 is about 276.2389759665.

The spelling of 21079236 in words is "twenty-one million, seventy-nine thousand, two hundred thirty-six".