22142391 has 16 divisors (see below), whose sum is σ = 31920000. Its totient is φ = 13605408.

The previous prime is 22142387. The next prime is 22142411. The reversal of 22142391 is 19324122.

It is not a de Polignac number, because 22142391 - 2² = 22142387 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22141391) 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, 3141 + ... + 7358.

It is an arithmetic number, because the mean of its divisors is an integer number (1995000).

Almost surely, 2^22142391 is an apocalyptic number.

22142391 is a deficient number, since it is larger than the sum of its proper divisors (9777609).

22142391 is a wasteful number, since it uses less digits than its factorization.

22142391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10558.

The product of its digits is 864, while the sum is 24.

The square root of 22142391 is about 4705.5702098683. The cubic root of 22142391 is about 280.8071565168.

The spelling of 22142391 in words is "twenty-two million, one hundred forty-two thousand, three hundred ninety-one".