21772854 has 32 divisors (see below), whose sum is σ = 48660480. Its totient is φ = 7216200.

The previous prime is 21772853. The next prime is 21772897. The reversal of 21772854 is 45827712.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21772853) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9259 + ... + 11369.

It is an arithmetic number, because the mean of its divisors is an integer number (1520640).

Almost surely, 2^21772854 is an apocalyptic number.

21772854 is an abundant number, since it is smaller than the sum of its proper divisors (26887626).

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

21772854 is a wasteful number, since it uses less digits than its factorization.

21772854 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2313 (or 2307 counting only the distinct ones).

The product of its digits is 31360, while the sum is 36.

The square root of 21772854 is about 4666.1390892257. The cubic root of 21772854 is about 279.2362434238.

The spelling of 21772854 in words is "twenty-one million, seven hundred seventy-two thousand, eight hundred fifty-four".