345031021 has 2 divisors, whose sum is σ = 345031022. Its totient is φ = 345031020.

The previous prime is 345030991. The next prime is 345031033. The reversal of 345031021 is 120130543.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 173054025 + 171976996 = 13155^2 + 13114^2 .

It is a cyclic number.

It is not a de Polignac number, because 345031021 - 2¹⁷ = 344899949 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 345031021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (345031091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172515510 + 172515511.

It is an arithmetic number, because the mean of its divisors is an integer number (172515511).

Almost surely, 2^345031021 is an apocalyptic number.

It is an amenable number.

345031021 is a deficient number, since it is larger than the sum of its proper divisors (1).

345031021 is an equidigital number, since it uses as much as digits as its factorization.

345031021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 345031021 is about 18575.0106594855. The cubic root of 345031021 is about 701.3789288056.

Adding to 345031021 its reverse (120130543), we get a palindrome (465161564).

The spelling of 345031021 in words is "three hundred forty-five million, thirty-one thousand, twenty-one".