351223021 has 2 divisors, whose sum is σ = 351223022. Its totient is φ = 351223020.

The previous prime is 351223001. The next prime is 351223027. The reversal of 351223021 is 120322153.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 351150121 + 72900 = 18739^2 + 270^2 .

It is a cyclic number.

It is not a de Polignac number, because 351223021 - 2²¹ = 349125869 is a prime.

It is a super-2 number, since 2×351223021² = 246715220960732882, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 351223021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (351223027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 175611510 + 175611511.

It is an arithmetic number, because the mean of its divisors is an integer number (175611511).

Almost surely, 2^351223021 is an apocalyptic number.

It is an amenable number.

351223021 is a deficient number, since it is larger than the sum of its proper divisors (1).

351223021 is an equidigital number, since it uses as much as digits as its factorization.

351223021 is an odious number, because the sum of its binary digits is odd.

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

The square root of 351223021 is about 18740.9450402054. The cubic root of 351223021 is about 705.5497755434.

Adding to 351223021 its reverse (120322153), we get a palindrome (471545174).

The spelling of 351223021 in words is "three hundred fifty-one million, two hundred twenty-three thousand, twenty-one".