343861262720021 has 4 divisors (see below), whose sum is σ = 344021870504844. Its totient is φ = 343700654935200.

The previous prime is 343861262719993. The next prime is 343861262720033. The reversal of 343861262720021 is 120027262168343.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 302916237351121 + 40945025368900 = 17404489^2 + 6398830^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-343861262720021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (343861262720221) 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, 80303889200 + ... + 80303893481.

It is an arithmetic number, because the mean of its divisors is an integer number (86005467626211).

Almost surely, 2^{343861262720021} is an apocalyptic number.

It is an amenable number.

343861262720021 is a deficient number, since it is larger than the sum of its proper divisors (160607784823).

343861262720021 is a wasteful number, since it uses less digits than its factorization.

343861262720021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160607784822.

The product of its (nonzero) digits is 1161216, while the sum is 47.

The spelling of 343861262720021 in words is "three hundred forty-three trillion, eight hundred sixty-one billion, two hundred sixty-two million, seven hundred twenty thousand, twenty-one".