21299754 has 16 divisors (see below), whose sum is σ = 48685248. Its totient is φ = 6085632.

The previous prime is 21299737. The next prime is 21299783. The reversal of 21299754 is 45799212.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 253527 + ... + 253610.

It is an arithmetic number, because the mean of its divisors is an integer number (3042828).

Almost surely, 2^21299754 is an apocalyptic number.

21299754 is an abundant number, since it is smaller than the sum of its proper divisors (27385494).

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

21299754 is a wasteful number, since it uses less digits than its factorization.

21299754 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 507149.

The product of its digits is 45360, while the sum is 39.

The square root of 21299754 is about 4615.1656524983. The cubic root of 21299754 is about 277.1989170159.

The spelling of 21299754 in words is "twenty-one million, two hundred ninety-nine thousand, seven hundred fifty-four".