21469506 has 32 divisors (see below), whose sum is σ = 46172160. Its totient is φ = 6633936.

The previous prime is 21469493. The next prime is 21469517. The reversal of 21469506 is 60596412.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 3355 + ... + 7361.

It is an arithmetic number, because the mean of its divisors is an integer number (1442880).

Almost surely, 2^21469506 is an apocalyptic number.

21469506 is an abundant number, since it is smaller than the sum of its proper divisors (24702654).

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

21469506 is a wasteful number, since it uses less digits than its factorization.

21469506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4078.

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 21469506 is about 4633.5198283810. The cubic root of 21469506 is about 277.9333639435.

The spelling of 21469506 in words is "twenty-one million, four hundred sixty-nine thousand, five hundred six".