21279036 has 24 divisors (see below), whose sum is σ = 52572240. Its totient is φ = 6675712.

The previous prime is 21279029. The next prime is 21279047. The reversal of 21279036 is 63097212.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 21278994 and 21279012.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 51951 + ... + 52358.

It is an arithmetic number, because the mean of its divisors is an integer number (2190510).

Almost surely, 2^21279036 is an apocalyptic number.

It is an amenable number.

21279036 is an abundant number, since it is smaller than the sum of its proper divisors (31293204).

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

21279036 is a wasteful number, since it uses less digits than its factorization.

21279036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104333 (or 104331 counting only the distinct ones).

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

The square root of 21279036 is about 4612.9205499336. The cubic root of 21279036 is about 277.1090119053.

The spelling of 21279036 in words is "twenty-one million, two hundred seventy-nine thousand, thirty-six".