4221646431281 has 2 divisors, whose sum is σ = 4221646431282. Its totient is φ = 4221646431280.

The previous prime is 4221646431257. The next prime is 4221646431293. The reversal of 4221646431281 is 1821346461224.

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., 4081979792881 + 139666638400 = 2020391^2 + 373720^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4221646431281 is a prime.

It is a super-2 number, since 2×4221646431281² (a number of 26 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (4221646431181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2110823215640 + 2110823215641.

It is an arithmetic number, because the mean of its divisors is an integer number (2110823215641).

Almost surely, 2^{4221646431281} is an apocalyptic number.

It is an amenable number.

4221646431281 is a deficient number, since it is larger than the sum of its proper divisors (1).

4221646431281 is an equidigital number, since it uses as much as digits as its factorization.

4221646431281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 442368, while the sum is 44.

The spelling of 4221646431281 in words is "four trillion, two hundred twenty-one billion, six hundred forty-six million, four hundred thirty-one thousand, two hundred eighty-one".