356421067421 has 2 divisors, whose sum is σ = 356421067422. Its totient is φ = 356421067420.

The previous prime is 356421067403. The next prime is 356421067487. The reversal of 356421067421 is 124760124653.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 356392284196 + 28783225 = 596986^2 + 5365^2 .

It is a cyclic number.

It is not a de Polignac number, because 356421067421 - 2¹⁴ = 356421051037 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (356421067921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 178210533710 + 178210533711.

It is an arithmetic number, because the mean of its divisors is an integer number (178210533711).

Almost surely, 2^356421067421 is an apocalyptic number.

It is an amenable number.

356421067421 is a deficient number, since it is larger than the sum of its proper divisors (1).

356421067421 is an equidigital number, since it uses as much as digits as its factorization.

356421067421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 241920, while the sum is 41.

The spelling of 356421067421 in words is "three hundred fifty-six billion, four hundred twenty-one million, sixty-seven thousand, four hundred twenty-one".