21120021021191 has 2 divisors, whose sum is σ = 21120021021192. Its totient is φ = 21120021021190.

The previous prime is 21120021021181. The next prime is 21120021021217. The reversal of 21120021021191 is 19112012002112.

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-21120021021191 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21120021021161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560010510595 + 10560010510596.

It is an arithmetic number, because the mean of its divisors is an integer number (10560010510596).

Almost surely, 2^{21120021021191} is an apocalyptic number.

21120021021191 is a deficient number, since it is larger than the sum of its proper divisors (1).

21120021021191 is an equidigital number, since it uses as much as digits as its factorization.

21120021021191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 23.

The spelling of 21120021021191 in words is "twenty-one trillion, one hundred twenty billion, twenty-one million, twenty-one thousand, one hundred ninety-one".