343260213521 has 4 divisors (see below), whose sum is σ = 345729711600. Its totient is φ = 340790715444.

The previous prime is 343260213493. The next prime is 343260213557. The reversal of 343260213521 is 125312062343.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 125312062343 = 13 ⋅9639389411.

It is a cyclic number.

It is not a de Polignac number, because 343260213521 - 2²² = 343256019217 is a prime.

It is a super-2 number, since 2×343260213521² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (343260215521) 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, 1234748831 + ... + 1234749108.

It is an arithmetic number, because the mean of its divisors is an integer number (86432427900).

Almost surely, 2^343260213521 is an apocalyptic number.

It is an amenable number.

343260213521 is a deficient number, since it is larger than the sum of its proper divisors (2469498079).

343260213521 is a wasteful number, since it uses less digits than its factorization.

343260213521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2469498078.

The product of its (nonzero) digits is 25920, while the sum is 32.

Adding to 343260213521 its reverse (125312062343), we get a palindrome (468572275864).

The spelling of 343260213521 in words is "three hundred forty-three billion, two hundred sixty million, two hundred thirteen thousand, five hundred twenty-one".