221421203312399 has 4 divisors (see below), whose sum is σ = 224454370481136. Its totient is φ = 218388036143664.

The previous prime is 221421203312389. The next prime is 221421203312411. The reversal of 221421203312399 is 993213302124122.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 221421203312399 - 2¹² = 221421203308303 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221421203312389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1516583584259 + ... + 1516583584404.

It is an arithmetic number, because the mean of its divisors is an integer number (56113592620284).

Almost surely, 2^{221421203312399} is an apocalyptic number.

221421203312399 is a deficient number, since it is larger than the sum of its proper divisors (3033167168737).

221421203312399 is an equidigital number, since it uses as much as digits as its factorization.

221421203312399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3033167168736.

The product of its (nonzero) digits is 279936, while the sum is 44.

The spelling of 221421203312399 in words is "two hundred twenty-one trillion, four hundred twenty-one billion, two hundred three million, three hundred twelve thousand, three hundred ninety-nine".