10211209991 has 2 divisors, whose sum is σ = 10211209992. Its totient is φ = 10211209990.

The previous prime is 10211209969. The next prime is 10211210003. The reversal of 10211209991 is 19990211201.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 10211209991 - 2³⁰ = 9137468167 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10211209901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5105604995 + 5105604996.

It is an arithmetic number, because the mean of its divisors is an integer number (5105604996).

Almost surely, 2^10211209991 is an apocalyptic number.

10211209991 is a deficient number, since it is larger than the sum of its proper divisors (1).

10211209991 is an equidigital number, since it uses as much as digits as its factorization.

10211209991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2916, while the sum is 35.

The spelling of 10211209991 in words is "ten billion, two hundred eleven million, two hundred nine thousand, nine hundred ninety-one".