22138261 has 8 divisors (see below), whose sum is σ = 22408448. Its totient is φ = 21870000.

The previous prime is 22138243. The next prime is 22138279. The reversal of 22138261 is 16283122.

It is an interprime number because it is at equal distance from previous prime (22138243) and next prime (22138279).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a 7-Lehmer number, since φ(22138261) divides (22138261-1)⁷.

It is a cyclic number.

It is not a de Polignac number, because 22138261 - 2⁵ = 22138229 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22132261) 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 7 ways as a sum of consecutive naturals, for example, 40651 + ... + 41191.

It is an arithmetic number, because the mean of its divisors is an integer number (2801056).

Almost surely, 2^22138261 is an apocalyptic number.

It is an amenable number.

22138261 is a deficient number, since it is larger than the sum of its proper divisors (270187).

22138261 is a wasteful number, since it uses less digits than its factorization.

22138261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 963.

The product of its digits is 1152, while the sum is 25.

The square root of 22138261 is about 4705.1313477947. The cubic root of 22138261 is about 280.7896967091.

The spelling of 22138261 in words is "twenty-two million, one hundred thirty-eight thousand, two hundred sixty-one".