1371672921 has 4 divisors (see below), whose sum is σ = 1828897232. Its totient is φ = 914448612.

The previous prime is 1371672899. The next prime is 1371672923. The reversal of 1371672921 is 1292761731.

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 not a de Polignac number, because 1371672921 - 2⁵ = 1371672889 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1371672921.

It is not an unprimeable number, because it can be changed into a prime (1371672923) 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, 228612151 + ... + 228612156.

It is an arithmetic number, because the mean of its divisors is an integer number (457224308).

Almost surely, 2^1371672921 is an apocalyptic number.

It is an amenable number.

1371672921 is a deficient number, since it is larger than the sum of its proper divisors (457224311).

1371672921 is an equidigital number, since it uses as much as digits as its factorization.

1371672921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 457224310.

The product of its digits is 31752, while the sum is 39.

The square root of 1371672921 is about 37036.1029402393. The cubic root of 1371672921 is about 1111.0924290966.

The spelling of 1371672921 in words is "one billion, three hundred seventy-one million, six hundred seventy-two thousand, nine hundred twenty-one".