354211621 has 2 divisors, whose sum is σ = 354211622. Its totient is φ = 354211620.

The previous prime is 354211577. The next prime is 354211631. The reversal of 354211621 is 126112453.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 353966596 + 245025 = 18814^2 + 495^2 .

It is an emirp because it is prime and its reverse (126112453) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 354211621 - 2¹⁷ = 354080549 is a prime.

It is a super-3 number, since 3×354211621³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (354211631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 177105810 + 177105811.

It is an arithmetic number, because the mean of its divisors is an integer number (177105811).

Almost surely, 2^354211621 is an apocalyptic number.

It is an amenable number.

354211621 is a deficient number, since it is larger than the sum of its proper divisors (1).

354211621 is an equidigital number, since it uses as much as digits as its factorization.

354211621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1440, while the sum is 25.

The square root of 354211621 is about 18820.5106466323. The cubic root of 354211621 is about 707.5453294135.

The spelling of 354211621 in words is "three hundred fifty-four million, two hundred eleven thousand, six hundred twenty-one".