21969495 has 32 divisors (see below), whose sum is σ = 39441600. Its totient is φ = 11601792.

The previous prime is 21969461. The next prime is 21969503. The reversal of 21969495 is 59496912.

It is not a de Polignac number, because 21969495 - 2⁹ = 21968983 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 21969495.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13969 + ... + 15461.

It is an arithmetic number, because the mean of its divisors is an integer number (1232550).

Almost surely, 2^21969495 is an apocalyptic number.

21969495 is a deficient number, since it is larger than the sum of its proper divisors (17472105).

21969495 is a wasteful number, since it uses less digits than its factorization.

21969495 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1616 (or 1610 counting only the distinct ones).

The product of its digits is 174960, while the sum is 45.

The square root of 21969495 is about 4687.1627878707. The cubic root of 21969495 is about 280.0743637518.

The spelling of 21969495 in words is "twenty-one million, nine hundred sixty-nine thousand, four hundred ninety-five".