21799492 has 48 divisors (see below), whose sum is σ = 46795392. Its totient is φ = 8743680.

The previous prime is 21799487. The next prime is 21799499. The reversal of 21799492 is 29499712.

It is not an unprimeable number, because it can be changed into a prime (21799499) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12328 + ... + 13984.

It is an arithmetic number, because the mean of its divisors is an integer number (974904).

Almost surely, 2^21799492 is an apocalyptic number.

21799492 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21799492 is an abundant number, since it is smaller than the sum of its proper divisors (24995900).

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

21799492 is a wasteful number, since it uses less digits than its factorization.

21799492 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1708 (or 1706 counting only the distinct ones).

The product of its digits is 81648, while the sum is 43.

The square root of 21799492 is about 4668.9926108316. The cubic root of 21799492 is about 279.3500742159.

The spelling of 21799492 in words is "twenty-one million, seven hundred ninety-nine thousand, four hundred ninety-two".