21202019983 has 2 divisors, whose sum is σ = 21202019984. Its totient is φ = 21202019982.

The previous prime is 21202019911. The next prime is 21202020013. The reversal of 21202019983 is 38991020212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21202019983 - 2²⁵ = 21168465551 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21202019903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10601009991 + 10601009992.

It is an arithmetic number, because the mean of its divisors is an integer number (10601009992).

Almost surely, 2^21202019983 is an apocalyptic number.

21202019983 is a deficient number, since it is larger than the sum of its proper divisors (1).

21202019983 is an equidigital number, since it uses as much as digits as its factorization.

21202019983 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 37.

The spelling of 21202019983 in words is "twenty-one billion, two hundred two million, nineteen thousand, nine hundred eighty-three".