1157183771221 has 4 divisors (see below), whose sum is σ = 1157227632000. Its totient is φ = 1157139910444.

The previous prime is 1157183771203. The next prime is 1157183771243. The reversal of 1157183771221 is 1221773817511.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1157183771221 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 (1157183771291) 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, 21890791 + ... + 21943588.

It is an arithmetic number, because the mean of its divisors is an integer number (289306908000).

Almost surely, 2^{1157183771221} is an apocalyptic number.

It is an amenable number.

1157183771221 is a deficient number, since it is larger than the sum of its proper divisors (43860779).

1157183771221 is an equidigital number, since it uses as much as digits as its factorization.

1157183771221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43860778.

The product of its digits is 164640, while the sum is 46.

The spelling of 1157183771221 in words is "one trillion, one hundred fifty-seven billion, one hundred eighty-three million, seven hundred seventy-one thousand, two hundred twenty-one".