21122225345 has 16 divisors (see below), whose sum is σ = 27511357440. Its totient is φ = 15475126464.

The previous prime is 21122225323. The next prime is 21122225351. The reversal of 21122225345 is 54352222112.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21122225345 - 2⁶ = 21122225281 is a prime.

It is a super-2 number, since 2×21122225345² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1271105 + ... + 1287614.

It is an arithmetic number, because the mean of its divisors is an integer number (1719459840).

Almost surely, 2^21122225345 is an apocalyptic number.

It is an amenable number.

21122225345 is a deficient number, since it is larger than the sum of its proper divisors (6389132095).

21122225345 is a wasteful number, since it uses less digits than its factorization.

21122225345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2558864.

The product of its digits is 9600, while the sum is 29.

Adding to 21122225345 its reverse (54352222112), we get a palindrome (75474447457).

The spelling of 21122225345 in words is "twenty-one billion, one hundred twenty-two million, two hundred twenty-five thousand, three hundred forty-five".