21132203291 has 2 divisors, whose sum is σ = 21132203292. Its totient is φ = 21132203290.

The previous prime is 21132203219. The next prime is 21132203303. The reversal of 21132203291 is 19230223112.

Together with previous prime (21132203219) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21132203291 - 2¹⁸ = 21131941147 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21132203291.

It is not a weakly prime, because it can be changed into another prime (21132203201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10566101645 + 10566101646.

It is an arithmetic number, because the mean of its divisors is an integer number (10566101646).

Almost surely, 2^21132203291 is an apocalyptic number.

21132203291 is a deficient number, since it is larger than the sum of its proper divisors (1).

21132203291 is an equidigital number, since it uses as much as digits as its factorization.

21132203291 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 26.

The spelling of 21132203291 in words is "twenty-one billion, one hundred thirty-two million, two hundred three thousand, two hundred ninety-one".