21122234305 has 4 divisors (see below), whose sum is σ = 25346681172. Its totient is φ = 16897787440.

The previous prime is 21122234291. The next prime is 21122234347. The reversal of 21122234305 is 50343222112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15587023104 + 5535211201 = 124848^2 + 74399^2 .

It is not a de Polignac number, because 21122234305 - 2³³ = 12532299713 is a prime.

It is a super-2 number, since 2×21122234305² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21122234305.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2112223426 + ... + 2112223435.

It is an arithmetic number, because the mean of its divisors is an integer number (6336670293).

Almost surely, 2^21122234305 is an apocalyptic number.

It is an amenable number.

21122234305 is a deficient number, since it is larger than the sum of its proper divisors (4224446867).

21122234305 is an equidigital number, since it uses as much as digits as its factorization.

21122234305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4224446866.

The product of its (nonzero) digits is 2880, while the sum is 25.

Adding to 21122234305 its reverse (50343222112), we get a palindrome (71465456417).

The spelling of 21122234305 in words is "twenty-one billion, one hundred twenty-two million, two hundred thirty-four thousand, three hundred five".