21122211107 has 2 divisors, whose sum is σ = 21122211108. Its totient is φ = 21122211106.

The previous prime is 21122211059. The next prime is 21122211157. The reversal of 21122211107 is 70111222112.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21122211107 is a prime.

It is a super-2 number, since 2×21122211107² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21122211157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10561105553 + 10561105554.

It is an arithmetic number, because the mean of its divisors is an integer number (10561105554).

Almost surely, 2^21122211107 is an apocalyptic number.

21122211107 is a deficient number, since it is larger than the sum of its proper divisors (1).

21122211107 is an equidigital number, since it uses as much as digits as its factorization.

21122211107 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 112, while the sum is 20.

Adding to 21122211107 its reverse (70111222112), we get a palindrome (91233433219).

The spelling of 21122211107 in words is "twenty-one billion, one hundred twenty-two million, two hundred eleven thousand, one hundred seven".