22155147 has 16 divisors (see below), whose sum is σ = 37511680. Its totient is φ = 12659976.

The previous prime is 22155143. The next prime is 22155157. The reversal of 22155147 is 74155122.

It is not a de Polignac number, because 22155147 - 2² = 22155143 is a prime.

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

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 22155147.

It is not an unprimeable number, because it can be changed into a prime (22155143) 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, 58423 + ... + 58800.

It is an arithmetic number, because the mean of its divisors is an integer number (2344480).

Almost surely, 2^22155147 is an apocalyptic number.

22155147 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

22155147 is a deficient number, since it is larger than the sum of its proper divisors (15356533).

22155147 is a wasteful number, since it uses less digits than its factorization.

22155147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117239 (or 117233 counting only the distinct ones).

The product of its digits is 2800, while the sum is 27.

The square root of 22155147 is about 4706.9254296196. The cubic root of 22155147 is about 280.8610695211.

The spelling of 22155147 in words is "twenty-two million, one hundred fifty-five thousand, one hundred forty-seven".