22215157 has 2 divisors, whose sum is σ = 22215158. Its totient is φ = 22215156.

The previous prime is 22215101. The next prime is 22215169. The reversal of 22215157 is 75151222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16329681 + 5885476 = 4041^2 + 2426^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22215157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22215187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11107578 + 11107579.

It is an arithmetic number, because the mean of its divisors is an integer number (11107579).

Almost surely, 2^22215157 is an apocalyptic number.

It is an amenable number.

22215157 is a deficient number, since it is larger than the sum of its proper divisors (1).

22215157 is an equidigital number, since it uses as much as digits as its factorization.

22215157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1400, while the sum is 25.

The square root of 22215157 is about 4713.2957683557. The cubic root of 22215157 is about 281.1144234130.

Adding to 22215157 its reverse (75151222), we get a palindrome (97366379).

The spelling of 22215157 in words is "twenty-two million, two hundred fifteen thousand, one hundred fifty-seven".