356143744921 has 2 divisors, whose sum is σ = 356143744922. Its totient is φ = 356143744920.

The previous prime is 356143744907. The next prime is 356143744933. The reversal of 356143744921 is 129447341653.

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., 254408263321 + 101735481600 = 504389^2 + 318960^2 .

It is a cyclic number.

It is not a de Polignac number, because 356143744921 - 2¹⁵ = 356143712153 is a prime.

It is not a weakly prime, because it can be changed into another prime (356143744721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 178071872460 + 178071872461.

It is an arithmetic number, because the mean of its divisors is an integer number (178071872461).

Almost surely, 2^356143744921 is an apocalyptic number.

It is an amenable number.

356143744921 is a deficient number, since it is larger than the sum of its proper divisors (1).

356143744921 is an equidigital number, since it uses as much as digits as its factorization.

356143744921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2177280, while the sum is 49.

The spelling of 356143744921 in words is "three hundred fifty-six billion, one hundred forty-three million, seven hundred forty-four thousand, nine hundred twenty-one".