12157222643 has 4 divisors (see below), whose sum is σ = 12158608128. Its totient is φ = 12155837160.

The previous prime is 12157222613. The next prime is 12157222673. The reversal of 12157222643 is 34622275121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34622275121 = 7 ⋅4946039303.

It is an interprime number because it is at equal distance from previous prime (12157222613) and next prime (12157222673).

It is a cyclic number.

It is not a de Polignac number, because 12157222643 - 2⁶ = 12157222579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12157222613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 679496 + ... + 697157.

It is an arithmetic number, because the mean of its divisors is an integer number (3039652032).

Almost surely, 2^12157222643 is an apocalyptic number.

12157222643 is a deficient number, since it is larger than the sum of its proper divisors (1385485).

12157222643 is an equidigital number, since it uses as much as digits as its factorization.

12157222643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1385484.

The product of its digits is 40320, while the sum is 35.

Adding to 12157222643 its reverse (34622275121), we get a palindrome (46779497764).

The spelling of 12157222643 in words is "twelve billion, one hundred fifty-seven million, two hundred twenty-two thousand, six hundred forty-three".