1138257914221 has 4 divisors (see below), whose sum is σ = 1138406267772. Its totient is φ = 1138109560672.

The previous prime is 1138257914179. The next prime is 1138257914237. The reversal of 1138257914221 is 1224197528311.

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 237393072900 + 900864841321 = 487230^2 + 949139^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1138257914221 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 (1138257914251) 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, 74165266 + ... + 74180611.

It is an arithmetic number, because the mean of its divisors is an integer number (284601566943).

Almost surely, 2^{1138257914221} is an apocalyptic number.

It is an amenable number.

1138257914221 is a deficient number, since it is larger than the sum of its proper divisors (148353551).

1138257914221 is an equidigital number, since it uses as much as digits as its factorization.

1138257914221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148353550.

The product of its digits is 241920, while the sum is 46.

The spelling of 1138257914221 in words is "one trillion, one hundred thirty-eight billion, two hundred fifty-seven million, nine hundred fourteen thousand, two hundred twenty-one".