21949722 has 24 divisors (see below), whose sum is σ = 47660340. Its totient is φ = 7300800.

The previous prime is 21949709. The next prime is 21949747. The reversal of 21949722 is 22794912.

It can be written as a sum of positive squares in 2 ways, for example, as 16232841 + 5716881 = 4029^2 + 2391^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9804 + ... + 11832.

Almost surely, 2^21949722 is an apocalyptic number.

21949722 is an abundant number, since it is smaller than the sum of its proper divisors (25710618).

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

21949722 is a wasteful number, since it uses less digits than its factorization.

21949722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2638 (or 2635 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 21949722 is about 4685.0530413219. The cubic root of 21949722 is about 279.9903142908.

The spelling of 21949722 in words is "twenty-one million, nine hundred forty-nine thousand, seven hundred twenty-two".