22151427 has 4 divisors (see below), whose sum is σ = 29535240. Its totient is φ = 14767616.

The previous prime is 22151417. The next prime is 22151431. The reversal of 22151427 is 72415122.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 22151427 - 2⁴ = 22151411 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22151397 and 22151406.

It is not an unprimeable number, because it can be changed into a prime (22151417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3691902 + ... + 3691907.

It is an arithmetic number, because the mean of its divisors is an integer number (7383810).

Almost surely, 2^22151427 is an apocalyptic number.

22151427 is a deficient number, since it is larger than the sum of its proper divisors (7383813).

22151427 is an equidigital number, since it uses as much as digits as its factorization.

22151427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7383812.

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

The square root of 22151427 is about 4706.5302506199. The cubic root of 22151427 is about 280.8453491460.

Adding to 22151427 its reverse (72415122), we get a palindrome (94566549).

It can be divided in two parts, 22151 and 427, that added together give a triangular number (22578 = T₂₁₂).

The spelling of 22151427 in words is "twenty-two million, one hundred fifty-one thousand, four hundred twenty-seven".