21965894 has 12 divisors (see below), whose sum is σ = 33233964. Its totient is φ = 10888584.

The previous prime is 21965893. The next prime is 21965899. The reversal of 21965894 is 49856912.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21965893) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 77477 + ... + 77759.

It is an arithmetic number, because the mean of its divisors is an integer number (2769497).

Almost surely, 2^21965894 is an apocalyptic number.

21965894 is a deficient number, since it is larger than the sum of its proper divisors (11268070).

21965894 is an equidigital number, since it uses as much as digits as its factorization.

21965894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 679 (or 482 counting only the distinct ones).

The product of its digits is 155520, while the sum is 44.

The square root of 21965894 is about 4686.7786378279. The cubic root of 21965894 is about 280.0590606707.

The spelling of 21965894 in words is "twenty-one million, nine hundred sixty-five thousand, eight hundred ninety-four".