201221999999983 has 2 divisors, whose sum is σ = 201221999999984. Its totient is φ = 201221999999982.

The previous prime is 201221999999941. The next prime is 201222000000019. The reversal of 201221999999983 is 389999999122102.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201221999999983 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 201221999999897 and 201221999999906.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201221999999483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100610999999991 + 100610999999992.

It is an arithmetic number, because the mean of its divisors is an integer number (100610999999992).

Almost surely, 2^{201221999999983} is an apocalyptic number.

201221999999983 is a deficient number, since it is larger than the sum of its proper divisors (1).

201221999999983 is an equidigital number, since it uses as much as digits as its factorization.

201221999999983 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 918330048, while the sum is 82.

The spelling of 201221999999983 in words is "two hundred one trillion, two hundred twenty-one billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred eighty-three".