21970446 has 16 divisors (see below), whose sum is σ = 44063184. Its totient is φ = 7303104.

The previous prime is 21970433. The next prime is 21970447. The reversal of 21970446 is 64407912.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21970447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2671 + ... + 7146.

It is an arithmetic number, because the mean of its divisors is an integer number (2753949).

Almost surely, 2^21970446 is an apocalyptic number.

21970446 is an abundant number, since it is smaller than the sum of its proper divisors (22092738).

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

21970446 is a wasteful number, since it uses less digits than its factorization.

21970446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10195.

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 21970446 is about 4687.2642340709. The cubic root of 21970446 is about 280.0784049139.

The spelling of 21970446 in words is "twenty-one million, nine hundred seventy thousand, four hundred forty-six".