22772421 has 20 divisors (see below), whose sum is σ = 38878752. Its totient is φ = 13012488.

The previous prime is 22772419. The next prime is 22772441. The reversal of 22772421 is 12427722.

It is not a de Polignac number, because 22772421 - 2¹ = 22772419 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22772441) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 19515 + ... + 20648.

Almost surely, 2^22772421 is an apocalyptic number.

22772421 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

22772421 is a deficient number, since it is larger than the sum of its proper divisors (16106331).

22772421 is an equidigital number, since it uses as much as digits as its factorization.

22772421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40182 (or 40173 counting only the distinct ones).

The product of its digits is 3136, while the sum is 27.

The square root of 22772421 is about 4772.0457877099. The cubic root of 22772421 is about 283.4456097892.

The spelling of 22772421 in words is "twenty-two million, seven hundred seventy-two thousand, four hundred twenty-one".