221245879399 has 2 divisors, whose sum is σ = 221245879400. Its totient is φ = 221245879398.

The previous prime is 221245879363. The next prime is 221245879409. The reversal of 221245879399 is 993978542122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221245879399 - 2⁷ = 221245879271 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221245879999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110622939699 + 110622939700.

It is an arithmetic number, because the mean of its divisors is an integer number (110622939700).

Almost surely, 2^221245879399 is an apocalyptic number.

221245879399 is a deficient number, since it is larger than the sum of its proper divisors (1).

221245879399 is an equidigital number, since it uses as much as digits as its factorization.

221245879399 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19595520, while the sum is 61.

The spelling of 221245879399 in words is "two hundred twenty-one billion, two hundred forty-five million, eight hundred seventy-nine thousand, three hundred ninety-nine".