349943730421 has 2 divisors, whose sum is σ = 349943730422. Its totient is φ = 349943730420.

The previous prime is 349943730407. The next prime is 349943730467. The reversal of 349943730421 is 124037349943.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 309909323025 + 40034407396 = 556695^2 + 200086^2 .

It is a cyclic number.

It is not a de Polignac number, because 349943730421 - 2²⁷ = 349809512693 is a prime.

It is a super-2 number, since 2×349943730421² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (349943730221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 174971865210 + 174971865211.

It is an arithmetic number, because the mean of its divisors is an integer number (174971865211).

Almost surely, 2^349943730421 is an apocalyptic number.

It is an amenable number.

349943730421 is a deficient number, since it is larger than the sum of its proper divisors (1).

349943730421 is an equidigital number, since it uses as much as digits as its factorization.

349943730421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1959552, while the sum is 49.

The spelling of 349943730421 in words is "three hundred forty-nine billion, nine hundred forty-three million, seven hundred thirty thousand, four hundred twenty-one".