1222216157 has 4 divisors (see below), whose sum is σ = 1230419100. Its totient is φ = 1214013216.

The previous prime is 1222216111. The next prime is 1222216181. The reversal of 1222216157 is 7516122221.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7516122221 = 2753 ⋅2730157.

It can be written as a sum of positive squares in 2 ways, for example, as 630461881 + 591754276 = 25109^2 + 24326^2 .

It is a cyclic number.

It is not a de Polignac number, because 1222216157 - 2²² = 1218021853 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222216657) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4101248 + ... + 4101545.

It is an arithmetic number, because the mean of its divisors is an integer number (307604775).

Almost surely, 2^1222216157 is an apocalyptic number.

It is an amenable number.

1222216157 is a deficient number, since it is larger than the sum of its proper divisors (8202943).

1222216157 is an equidigital number, since it uses as much as digits as its factorization.

1222216157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8202942.

The product of its digits is 3360, while the sum is 29.

The square root of 1222216157 is about 34960.2081944602. The cubic root of 1222216157 is about 1069.1763414131.

Adding to 1222216157 its reverse (7516122221), we get a palindrome (8738338378).

The spelling of 1222216157 in words is "one billion, two hundred twenty-two million, two hundred sixteen thousand, one hundred fifty-seven".