743221243501921 has 2 divisors, whose sum is σ = 743221243501922. Its totient is φ = 743221243501920.

The previous prime is 743221243501853. The next prime is 743221243501931. The reversal of 743221243501921 is 129105342122347.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 521262049594896 + 221959193907025 = 22831164^2 + 14898295^2 .

It is a cyclic number.

It is not a de Polignac number, because 743221243501921 - 2¹¹ = 743221243499873 is a prime.

It is not a weakly prime, because it can be changed into another prime (743221243501931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 371610621750960 + 371610621750961.

It is an arithmetic number, because the mean of its divisors is an integer number (371610621750961).

Almost surely, 2^{743221243501921} is an apocalyptic number.

It is an amenable number.

743221243501921 is a deficient number, since it is larger than the sum of its proper divisors (1).

743221243501921 is an equidigital number, since it uses as much as digits as its factorization.

743221243501921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 725760, while the sum is 46.

The spelling of 743221243501921 in words is "seven hundred forty-three trillion, two hundred twenty-one billion, two hundred forty-three million, five hundred one thousand, nine hundred twenty-one".