221421203312389 has 2 divisors, whose sum is σ = 221421203312390. Its totient is φ = 221421203312388.

The previous prime is 221421203312263. The next prime is 221421203312411. The reversal of 221421203312389 is 983213302124122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 214890444176164 + 6530759136225 = 14659142^2 + 2555535^2 .

It is a cyclic number.

It is not a de Polignac number, because 221421203312389 - 2¹⁵ = 221421203279621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221421203382389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110710601656194 + 110710601656195.

It is an arithmetic number, because the mean of its divisors is an integer number (110710601656195).

Almost surely, 2^{221421203312389} is an apocalyptic number.

It is an amenable number.

221421203312389 is a deficient number, since it is larger than the sum of its proper divisors (1).

221421203312389 is an equidigital number, since it uses as much as digits as its factorization.

221421203312389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 248832, while the sum is 43.

The spelling of 221421203312389 in words is "two hundred twenty-one trillion, four hundred twenty-one billion, two hundred three million, three hundred twelve thousand, three hundred eighty-nine".