1138158437921 has 4 divisors (see below), whose sum is σ = 1138164486144. Its totient is φ = 1138152389700.

The previous prime is 1138158437917. The next prime is 1138158437957. The reversal of 1138158437921 is 1297348518311.

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 not a de Polignac number, because 1138158437921 - 2² = 1138158437917 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1138158407921) 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, 2732465 + ... + 3121326.

It is an arithmetic number, because the mean of its divisors is an integer number (284541121536).

Almost surely, 2^{1138158437921} is an apocalyptic number.

It is an amenable number.

1138158437921 is a deficient number, since it is larger than the sum of its proper divisors (6048223).

1138158437921 is an equidigital number, since it uses as much as digits as its factorization.

1138158437921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6048222.

The product of its digits is 1451520, while the sum is 53.

The spelling of 1138158437921 in words is "one trillion, one hundred thirty-eight billion, one hundred fifty-eight million, four hundred thirty-seven thousand, nine hundred twenty-one".