345125221 has 4 divisors (see below), whose sum is σ = 394428832. Its totient is φ = 295821612.

The previous prime is 345125219. The next prime is 345125227. The reversal of 345125221 is 122521543.

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.

It is a cyclic number.

It is not a de Polignac number, because 345125221 - 2¹ = 345125219 is a prime.

It is a super-2 number, since 2×345125221² = 238222836340597682, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (345125227) 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, 24651795 + ... + 24651808.

It is an arithmetic number, because the mean of its divisors is an integer number (98607208).

Almost surely, 2^345125221 is an apocalyptic number.

It is an amenable number.

345125221 is a deficient number, since it is larger than the sum of its proper divisors (49303611).

345125221 is an equidigital number, since it uses as much as digits as its factorization.

345125221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49303610.

The product of its digits is 2400, while the sum is 25.

The square root of 345125221 is about 18577.5461512009. The cubic root of 345125221 is about 701.4427529057.

Adding to 345125221 its reverse (122521543), we get a palindrome (467646764).

The spelling of 345125221 in words is "three hundred forty-five million, one hundred twenty-five thousand, two hundred twenty-one".