21221110411 has 2 divisors, whose sum is σ = 21221110412. Its totient is φ = 21221110410.

The previous prime is 21221110367. The next prime is 21221110487. The reversal of 21221110411 is 11401112212.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21221110411 is a prime.

It is not a weakly prime, because it can be changed into another prime (21221110511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610555205 + 10610555206.

It is an arithmetic number, because the mean of its divisors is an integer number (10610555206).

Almost surely, 2^21221110411 is an apocalyptic number.

21221110411 is a deficient number, since it is larger than the sum of its proper divisors (1).

21221110411 is an equidigital number, since it uses as much as digits as its factorization.

21221110411 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21221110411 its reverse (11401112212), we get a palindrome (32622222623).

The spelling of 21221110411 in words is "twenty-one billion, two hundred twenty-one million, one hundred ten thousand, four hundred eleven".