21150034410991 has 2 divisors, whose sum is σ = 21150034410992. Its totient is φ = 21150034410990.

The previous prime is 21150034410943. The next prime is 21150034411021. The reversal of 21150034410991 is 19901443005112.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21150034410991 - 2⁷ = 21150034410863 is a prime.

It is a super-2 number, since 2×21150034410991² (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 (21150034410691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10575017205495 + 10575017205496.

It is an arithmetic number, because the mean of its divisors is an integer number (10575017205496).

Almost surely, 2^{21150034410991} is an apocalyptic number.

21150034410991 is a deficient number, since it is larger than the sum of its proper divisors (1).

21150034410991 is an equidigital number, since it uses as much as digits as its factorization.

21150034410991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38880, while the sum is 40.

The spelling of 21150034410991 in words is "twenty-one trillion, one hundred fifty billion, thirty-four million, four hundred ten thousand, nine hundred ninety-one".