22212729 has 72 divisors (see below), whose sum is σ = 43037280. Its totient is φ = 10886400.

The previous prime is 22212719. The next prime is 22212737. The reversal of 22212729 is 92721222.

It is not a de Polignac number, because 22212729 - 2¹¹ = 22210681 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22212719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 92049 + ... + 92289.

It is an arithmetic number, because the mean of its divisors is an integer number (597740).

Almost surely, 2^22212729 is an apocalyptic number.

It is an amenable number.

22212729 is a deficient number, since it is larger than the sum of its proper divisors (20824551).

22212729 is a wasteful number, since it uses less digits than its factorization.

22212729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291 (or 281 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 22212729 is about 4713.0381920795. The cubic root of 22212729 is about 281.1041815964.

It can be divided in two parts, 2221 and 2729, that added together give a triangular number (4950 = T₉₉).

The spelling of 22212729 in words is "twenty-two million, two hundred twelve thousand, seven hundred twenty-nine".