374221721 has 2 divisors, whose sum is σ = 374221722. Its totient is φ = 374221720.

The previous prime is 374221691. The next prime is 374221723. The reversal of 374221721 is 127122473.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 370177600 + 4044121 = 19240^2 + 2011^2 .

It is a cyclic number.

It is not a de Polignac number, because 374221721 - 2¹⁰ = 374220697 is a prime.

Together with 374221723, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (374221723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 187110860 + 187110861.

It is an arithmetic number, because the mean of its divisors is an integer number (187110861).

Almost surely, 2^374221721 is an apocalyptic number.

It is an amenable number.

374221721 is a deficient number, since it is larger than the sum of its proper divisors (1).

374221721 is an equidigital number, since it uses as much as digits as its factorization.

374221721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4704, while the sum is 29.

The square root of 374221721 is about 19344.8112164477. The cubic root of 374221721 is about 720.6255629402.

The spelling of 374221721 in words is "three hundred seventy-four million, two hundred twenty-one thousand, seven hundred twenty-one".