21122120911 has 2 divisors, whose sum is σ = 21122120912. Its totient is φ = 21122120910.

The previous prime is 21122120879. The next prime is 21122120923. The reversal of 21122120911 is 11902122112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21122120911 - 2⁵ = 21122120879 is a prime.

It is a super-2 number, since 2×21122120911² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21122120011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10561060455 + 10561060456.

It is an arithmetic number, because the mean of its divisors is an integer number (10561060456).

Almost surely, 2^21122120911 is an apocalyptic number.

21122120911 is a deficient number, since it is larger than the sum of its proper divisors (1).

21122120911 is an equidigital number, since it uses as much as digits as its factorization.

21122120911 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 22.

The spelling of 21122120911 in words is "twenty-one billion, one hundred twenty-two million, one hundred twenty thousand, nine hundred eleven".