355206312421 has 2 divisors, whose sum is σ = 355206312422. Its totient is φ = 355206312420.

The previous prime is 355206312403. The next prime is 355206312479. The reversal of 355206312421 is 124213602553.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 207834780321 + 147371532100 = 455889^2 + 383890^2 .

It is a cyclic number.

It is not a de Polignac number, because 355206312421 - 2²¹ = 355204215269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (355206312821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 177603156210 + 177603156211.

It is an arithmetic number, because the mean of its divisors is an integer number (177603156211).

Almost surely, 2^355206312421 is an apocalyptic number.

It is an amenable number.

355206312421 is a deficient number, since it is larger than the sum of its proper divisors (1).

355206312421 is an equidigital number, since it uses as much as digits as its factorization.

355206312421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 43200, while the sum is 34.

Adding to 355206312421 its reverse (124213602553), we get a palindrome (479419914974).

The spelling of 355206312421 in words is "three hundred fifty-five billion, two hundred six million, three hundred twelve thousand, four hundred twenty-one".