10010221021991 has 2 divisors, whose sum is σ = 10010221021992. Its totient is φ = 10010221021990.

The previous prime is 10010221021967. The next prime is 10010221022023. The reversal of 10010221021991 is 19912012201001.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 10010221021991 - 2²² = 10010216827687 is a prime.

It is a super-2 number, since 2×10010221021991² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10010221021921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5005110510995 + 5005110510996.

It is an arithmetic number, because the mean of its divisors is an integer number (5005110510996).

Almost surely, 2^{10010221021991} is an apocalyptic number.

10010221021991 is a deficient number, since it is larger than the sum of its proper divisors (1).

10010221021991 is an equidigital number, since it uses as much as digits as its factorization.

10010221021991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 29.

Adding to 10010221021991 its reverse (19912012201001), we get a palindrome (29922233222992).

The spelling of 10010221021991 in words is "ten trillion, ten billion, two hundred twenty-one million, twenty-one thousand, nine hundred ninety-one".