21322212187 has 2 divisors, whose sum is σ = 21322212188. Its totient is φ = 21322212186.

The previous prime is 21322212161. The next prime is 21322212211. The reversal of 21322212187 is 78121222312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21322212187 - 2¹¹ = 21322210139 is a prime.

It is not a weakly prime, because it can be changed into another prime (21322212287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10661106093 + 10661106094.

It is an arithmetic number, because the mean of its divisors is an integer number (10661106094).

Almost surely, 2^21322212187 is an apocalyptic number.

21322212187 is a deficient number, since it is larger than the sum of its proper divisors (1).

21322212187 is an equidigital number, since it uses as much as digits as its factorization.

21322212187 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5376, while the sum is 31.

Adding to 21322212187 its reverse (78121222312), we get a palindrome (99443434499).

The spelling of 21322212187 in words is "twenty-one billion, three hundred twenty-two million, two hundred twelve thousand, one hundred eighty-seven".