137806367221 has 4 divisors (see below), whose sum is σ = 137810890944. Its totient is φ = 137801843500.

The previous prime is 137806367219. The next prime is 137806367273. The reversal of 137806367221 is 122763608731.

It is a happy number.

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 137806367221 - 2¹ = 137806367219 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 (137806367021) 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, 2215855 + ... + 2277196.

It is an arithmetic number, because the mean of its divisors is an integer number (34452722736).

Almost surely, 2^137806367221 is an apocalyptic number.

It is an amenable number.

137806367221 is a deficient number, since it is larger than the sum of its proper divisors (4523723).

137806367221 is an equidigital number, since it uses as much as digits as its factorization.

137806367221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4523722.

The product of its (nonzero) digits is 508032, while the sum is 46.

The spelling of 137806367221 in words is "one hundred thirty-seven billion, eight hundred six million, three hundred sixty-seven thousand, two hundred twenty-one".