201222019991 has 2 divisors, whose sum is σ = 201222019992. Its totient is φ = 201222019990.

The previous prime is 201222019961. The next prime is 201222020039. The reversal of 201222019991 is 199910222102.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201222019991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201222019961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100611009995 + 100611009996.

It is an arithmetic number, because the mean of its divisors is an integer number (100611009996).

Almost surely, 2^201222019991 is an apocalyptic number.

201222019991 is a deficient number, since it is larger than the sum of its proper divisors (1).

201222019991 is an equidigital number, since it uses as much as digits as its factorization.

201222019991 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 201222019991 in words is "two hundred one billion, two hundred twenty-two million, nineteen thousand, nine hundred ninety-one".