202012219991 has 2 divisors, whose sum is σ = 202012219992. Its totient is φ = 202012219990.

The previous prime is 202012219979. The next prime is 202012220021. The reversal of 202012219991 is 199912210202.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 202012219991 - 2²⁶ = 201945111127 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (202012215991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101006109995 + 101006109996.

It is an arithmetic number, because the mean of its divisors is an integer number (101006109996).

Almost surely, 2^202012219991 is an apocalyptic number.

202012219991 is a deficient number, since it is larger than the sum of its proper divisors (1).

202012219991 is an equidigital number, since it uses as much as digits as its factorization.

202012219991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 38.

The spelling of 202012219991 in words is "two hundred two billion, twelve million, two hundred nineteen thousand, nine hundred ninety-one".