1137888561221 has 4 divisors (see below), whose sum is σ = 1137954615744. Its totient is φ = 1137822506700.

The previous prime is 1137888561149. The next prime is 1137888561223. The reversal of 1137888561221 is 1221658887311.

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-1137888561221 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 (1137888561223) 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, 33001415 + ... + 33035876.

It is an arithmetic number, because the mean of its divisors is an integer number (284488653936).

Almost surely, 2^{1137888561221} is an apocalyptic number.

It is an amenable number.

1137888561221 is a deficient number, since it is larger than the sum of its proper divisors (66054523).

1137888561221 is an equidigital number, since it uses as much as digits as its factorization.

1137888561221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66054522.

The product of its digits is 1290240, while the sum is 53.

The spelling of 1137888561221 in words is "one trillion, one hundred thirty-seven billion, eight hundred eighty-eight million, five hundred sixty-one thousand, two hundred twenty-one".