21469542 has 8 divisors (see below), whose sum is σ = 42939096. Its totient is φ = 7156512.

The previous prime is 21469517. The next prime is 21469543. The reversal of 21469542 is 24596412.

It is a sphenic number, since it is the product of 3 distinct primes.

21469542 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21469543) by changing a digit.

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, 1789123 + ... + 1789134.

It is an arithmetic number, because the mean of its divisors is an integer number (5367387).

Almost surely, 2^21469542 is an apocalyptic number.

21469542 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21469542 is a wasteful number, since it uses less digits than its factorization.

21469542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3578262.

The product of its digits is 17280, while the sum is 33.

The square root of 21469542 is about 4633.5237131151. The cubic root of 21469542 is about 277.9335192894.

The spelling of 21469542 in words is "twenty-one million, four hundred sixty-nine thousand, five hundred forty-two".