21952782 has 20 divisors (see below), whose sum is σ = 49190856. Its totient is φ = 7317540.

The previous prime is 21952781. The next prime is 21952783. The reversal of 21952782 is 28725912.

It is an interprime number because it is at equal distance from previous prime (21952781) and next prime (21952783).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21952781) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 67594 + ... + 67917.

Almost surely, 2^21952782 is an apocalyptic number.

21952782 is an abundant number, since it is smaller than the sum of its proper divisors (27238074).

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

21952782 is a wasteful number, since it uses less digits than its factorization.

21952782 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135525 (or 135516 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 21952782 is about 4685.3796004166. The cubic root of 21952782 is about 280.0033247905.

The spelling of 21952782 in words is "twenty-one million, nine hundred fifty-two thousand, seven hundred eighty-two".