21299088 has 20 divisors (see below), whose sum is σ = 55022768. Its totient is φ = 7099680.

The previous prime is 21299071. The next prime is 21299093. The reversal of 21299088 is 88099212.

It is a super-2 number, since 2×21299088² = 907302299263488, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 221818 + ... + 221913.

Almost surely, 2^21299088 is an apocalyptic number.

It is an amenable number.

21299088 is an abundant number, since it is smaller than the sum of its proper divisors (33723680).

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

21299088 is a wasteful number, since it uses less digits than its factorization.

21299088 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 443742 (or 443736 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 39.

The square root of 21299088 is about 4615.0934985112. The cubic root of 21299088 is about 277.1960278369.

The spelling of 21299088 in words is "twenty-one million, two hundred ninety-nine thousand, eighty-eight".