22147251 has 16 divisors (see below), whose sum is σ = 34212864. Its totient is φ = 12481344.

The previous prime is 22147249. The next prime is 22147259. The reversal of 22147251 is 15274122.

It is not a de Polignac number, because 22147251 - 2¹ = 22147249 is a prime.

It is not an unprimeable number, because it can be changed into a prime (22147259) 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 15 ways as a sum of consecutive naturals, for example, 5691 + ... + 8756.

It is an arithmetic number, because the mean of its divisors is an integer number (2138304).

Almost surely, 2^22147251 is an apocalyptic number.

22147251 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

22147251 is a deficient number, since it is larger than the sum of its proper divisors (12065613).

22147251 is a wasteful number, since it uses less digits than its factorization.

22147251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14530.

The product of its digits is 1120, while the sum is 24.

The square root of 22147251 is about 4706.0865907886. The cubic root of 22147251 is about 280.8276996603.

The spelling of 22147251 in words is "twenty-two million, one hundred forty-seven thousand, two hundred fifty-one".