100213321991 has 2 divisors, whose sum is σ = 100213321992. Its totient is φ = 100213321990.

The previous prime is 100213321931. The next prime is 100213322029. The reversal of 100213321991 is 199123312001.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 100213321991 - 2¹⁰ = 100213320967 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100213321931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50106660995 + 50106660996.

It is an arithmetic number, because the mean of its divisors is an integer number (50106660996).

Almost surely, 2^100213321991 is an apocalyptic number.

100213321991 is a deficient number, since it is larger than the sum of its proper divisors (1).

100213321991 is an equidigital number, since it uses as much as digits as its factorization.

100213321991 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 32.

Adding to 100213321991 its reverse (199123312001), we get a palindrome (299336633992).

The spelling of 100213321991 in words is "one hundred billion, two hundred thirteen million, three hundred twenty-one thousand, nine hundred ninety-one".