21959470 has 32 divisors (see below), whose sum is σ = 43948800. Its totient is φ = 7845120.

The previous prime is 21959449. The next prime is 21959473. The reversal of 21959470 is 7495912.

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21959473) 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 15 ways as a sum of consecutive naturals, for example, 1306 + ... + 6754.

It is an arithmetic number, because the mean of its divisors is an integer number (1373400).

Almost surely, 2^21959470 is an apocalyptic number.

21959470 is an abundant number, since it is smaller than the sum of its proper divisors (21989330).

21959470 is a wasteful number, since it uses less digits than its factorization.

21959470 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5500.

The product of its (nonzero) digits is 22680, while the sum is 37.

The square root of 21959470 is about 4686.0932555808. The cubic root of 21959470 is about 280.0317566022.

The spelling of 21959470 in words is "twenty-one million, nine hundred fifty-nine thousand, four hundred seventy".