21222210311 has 2 divisors, whose sum is σ = 21222210312. Its totient is φ = 21222210310.

The previous prime is 21222210259. The next prime is 21222210337. The reversal of 21222210311 is 11301222212.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21222210311 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21222210311.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21222210371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10611105155 + 10611105156.

It is an arithmetic number, because the mean of its divisors is an integer number (10611105156).

Almost surely, 2^21222210311 is an apocalyptic number.

21222210311 is a deficient number, since it is larger than the sum of its proper divisors (1).

21222210311 is an equidigital number, since it uses as much as digits as its factorization.

21222210311 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21222210311 its reverse (11301222212), we get a palindrome (32523432523).

The spelling of 21222210311 in words is "twenty-one billion, two hundred twenty-two million, two hundred ten thousand, three hundred eleven".