1373547221 has 4 divisors (see below), whose sum is σ = 1445839200. Its totient is φ = 1301255244.

The previous prime is 1373547209. The next prime is 1373547229. The reversal of 1373547221 is 1227453731.

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 1373547221 - 2¹⁸ = 1373285077 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1373547229) 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, 36145961 + ... + 36145998.

It is an arithmetic number, because the mean of its divisors is an integer number (361459800).

Almost surely, 2^1373547221 is an apocalyptic number.

It is an amenable number.

1373547221 is a deficient number, since it is larger than the sum of its proper divisors (72291979).

1373547221 is an equidigital number, since it uses as much as digits as its factorization.

1373547221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72291978.

The product of its digits is 35280, while the sum is 35.

The square root of 1373547221 is about 37061.3979903619. The cubic root of 1373547221 is about 1111.5982767822.

The spelling of 1373547221 in words is "one billion, three hundred seventy-three million, five hundred forty-seven thousand, two hundred twenty-one".