345251321221 has 4 divisors (see below), whose sum is σ = 347246993772. Its totient is φ = 343255648672.

The previous prime is 345251321167. The next prime is 345251321257. The reversal of 345251321221 is 122123152543.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122123152543 = 7 ⋅17446164649.

It can be written as a sum of positive squares in 2 ways, for example, as 168022109025 + 177229212196 = 409905^2 + 420986^2 .

It is a cyclic number.

It is not a de Polignac number, because 345251321221 - 2¹¹ = 345251319173 is a prime.

It is a super-2 number, since 2×345251321221² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (345251328221) 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, 997836016 + ... + 997836361.

It is an arithmetic number, because the mean of its divisors is an integer number (86811748443).

Almost surely, 2^345251321221 is an apocalyptic number.

It is an amenable number.

345251321221 is a deficient number, since it is larger than the sum of its proper divisors (1995672551).

345251321221 is a wasteful number, since it uses less digits than its factorization.

345251321221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1995672550.

The product of its digits is 14400, while the sum is 31.

Adding to 345251321221 its reverse (122123152543), we get a palindrome (467374473764).

The spelling of 345251321221 in words is "three hundred forty-five billion, two hundred fifty-one million, three hundred twenty-one thousand, two hundred twenty-one".