221993951983 has 2 divisors, whose sum is σ = 221993951984. Its totient is φ = 221993951982.

The previous prime is 221993951951. The next prime is 221993952007. The reversal of 221993951983 is 389159399122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221993951983 - 2⁵ = 221993951951 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221993991983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110996975991 + 110996975992.

It is an arithmetic number, because the mean of its divisors is an integer number (110996975992).

Almost surely, 2^221993951983 is an apocalyptic number.

221993951983 is a deficient number, since it is larger than the sum of its proper divisors (1).

221993951983 is an equidigital number, since it uses as much as digits as its factorization.

221993951983 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9447840, while the sum is 61.

The spelling of 221993951983 in words is "two hundred twenty-one billion, nine hundred ninety-three million, nine hundred fifty-one thousand, nine hundred eighty-three".