21001003022291 has 2 divisors, whose sum is σ = 21001003022292. Its totient is φ = 21001003022290.

The previous prime is 21001003022273. The next prime is 21001003022347. The reversal of 21001003022291 is 19222030010012.

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-21001003022291 is a prime.

It is not a weakly prime, because it can be changed into another prime (21001003025291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500501511145 + 10500501511146.

It is an arithmetic number, because the mean of its divisors is an integer number (10500501511146).

Almost surely, 2^{21001003022291} is an apocalyptic number.

21001003022291 is a deficient number, since it is larger than the sum of its proper divisors (1).

21001003022291 is an equidigital number, since it uses as much as digits as its factorization.

21001003022291 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 23.

The spelling of 21001003022291 in words is "twenty-one trillion, one billion, three million, twenty-two thousand, two hundred ninety-one".