1137121255621 has 4 divisors (see below), whose sum is σ = 1224592121452. Its totient is φ = 1049650389792.

The previous prime is 1137121255601. The next prime is 1137121255657. The reversal of 1137121255621 is 1265521217311.

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

It can be written as a sum of positive squares in 2 ways, for example, as 554205802500 + 582915453121 = 744450^2 + 763489^2 .

It is a cyclic number.

It is not a de Polignac number, because 1137121255621 - 2¹⁷ = 1137121124549 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 (1137121255601) 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, 43735432896 + ... + 43735432921.

It is an arithmetic number, because the mean of its divisors is an integer number (306148030363).

Almost surely, 2^{1137121255621} is an apocalyptic number.

It is an amenable number.

1137121255621 is a deficient number, since it is larger than the sum of its proper divisors (87470865831).

1137121255621 is an equidigital number, since it uses as much as digits as its factorization.

1137121255621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87470865830.

The product of its digits is 25200, while the sum is 37.

The spelling of 1137121255621 in words is "one trillion, one hundred thirty-seven billion, one hundred twenty-one million, two hundred fifty-five thousand, six hundred twenty-one".