21299792 has 40 divisors (see below), whose sum is σ = 42851424. Its totient is φ = 10249344.

The previous prime is 21299791. The next prime is 21299807. The reversal of 21299792 is 29799212.

It is a super-2 number, since 2×21299792² = 907362278486528, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21299791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56918 + ... + 57290.

Almost surely, 2^21299792 is an apocalyptic number.

It is an amenable number.

21299792 is an abundant number, since it is smaller than the sum of its proper divisors (21551632).

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

21299792 is a wasteful number, since it uses less digits than its factorization.

21299792 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 507 (or 501 counting only the distinct ones).

The product of its digits is 40824, while the sum is 41.

The square root of 21299792 is about 4615.1697693584. The cubic root of 21299792 is about 277.1990818621.

The spelling of 21299792 in words is "twenty-one million, two hundred ninety-nine thousand, seven hundred ninety-two".