21132212291 has 2 divisors, whose sum is σ = 21132212292. Its totient is φ = 21132212290.

The previous prime is 21132212273. The next prime is 21132212317. The reversal of 21132212291 is 19221223112.

It is an a-pointer prime, because the next prime (21132212317) can be obtained adding 21132212291 to its sum of digits (26).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21132212291 - 2¹⁴ = 21132195907 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21132212291.

It is not a weakly prime, because it can be changed into another prime (21132212221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10566106145 + 10566106146.

It is an arithmetic number, because the mean of its divisors is an integer number (10566106146).

Almost surely, 2^21132212291 is an apocalyptic number.

21132212291 is a deficient number, since it is larger than the sum of its proper divisors (1).

21132212291 is an equidigital number, since it uses as much as digits as its factorization.

21132212291 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 26.

The spelling of 21132212291 in words is "twenty-one billion, one hundred thirty-two million, two hundred twelve thousand, two hundred ninety-one".