21122102705 has 32 divisors (see below), whose sum is σ = 27802310400. Its totient is φ = 15277588480.

The previous prime is 21122102689. The next prime is 21122102707. The reversal of 21122102705 is 50720122112.

It is not a de Polignac number, because 21122102705 - 2⁴ = 21122102689 is a prime.

It is a super-2 number, since 2×21122102705² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21122102707) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8716124 + ... + 8718546.

It is an arithmetic number, because the mean of its divisors is an integer number (868822200).

Almost surely, 2^21122102705 is an apocalyptic number.

It is an amenable number.

21122102705 is a deficient number, since it is larger than the sum of its proper divisors (6680207695).

21122102705 is a wasteful number, since it uses less digits than its factorization.

21122102705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3241.

The product of its (nonzero) digits is 560, while the sum is 23.

Adding to 21122102705 its reverse (50720122112), we get a palindrome (71842224817).

The spelling of 21122102705 in words is "twenty-one billion, one hundred twenty-two million, one hundred two thousand, seven hundred five".