21269874 has 16 divisors (see below), whose sum is σ = 42616512. Its totient is φ = 7077168.

The previous prime is 21269863. The next prime is 21269879. The reversal of 21269874 is 47896212.

It is not an unprimeable number, because it can be changed into a prime (21269879) by changing a digit.

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, 787 + ... + 6569.

It is an arithmetic number, because the mean of its divisors is an integer number (2663532).

Almost surely, 2^21269874 is an apocalyptic number.

21269874 is an abundant number, since it is smaller than the sum of its proper divisors (21346638).

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

21269874 is a wasteful number, since it uses less digits than its factorization.

21269874 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6401.

The product of its digits is 48384, while the sum is 39.

The square root of 21269874 is about 4611.9273628278. The cubic root of 21269874 is about 277.0692350840.

The spelling of 21269874 in words is "twenty-one million, two hundred sixty-nine thousand, eight hundred seventy-four".