743180021 has 2 divisors, whose sum is σ = 743180022. Its totient is φ = 743180020.

The previous prime is 743180017. The next prime is 743180023. The reversal of 743180021 is 120081347.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 713477521 + 29702500 = 26711^2 + 5450^2 .

It is an emirp because it is prime and its reverse (120081347) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 743180021 - 2² = 743180017 is a prime.

It is a super-2 number, since 2×743180021² = 1104633087227120882, which contains 22 as substring.

Together with 743180023, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (743180023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 371590010 + 371590011.

It is an arithmetic number, because the mean of its divisors is an integer number (371590011).

Almost surely, 2^743180021 is an apocalyptic number.

It is an amenable number.

743180021 is a deficient number, since it is larger than the sum of its proper divisors (1).

743180021 is an equidigital number, since it uses as much as digits as its factorization.

743180021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 743180021 is about 27261.3283058621. The cubic root of 743180021 is about 905.7979677904.

The spelling of 743180021 in words is "seven hundred forty-three million, one hundred eighty thousand, twenty-one".