21122203205 has 8 divisors (see below), whose sum is σ = 25381900800. Its totient is φ = 16874257936.

The previous prime is 21122203171. The next prime is 21122203211. The reversal of 21122203205 is 50230222112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21122203205 is a prime.

It is a super-2 number, since 2×21122203205² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2934125 + ... + 2941314.

It is an arithmetic number, because the mean of its divisors is an integer number (3172737600).

Almost surely, 2^21122203205 is an apocalyptic number.

It is an amenable number.

21122203205 is a deficient number, since it is larger than the sum of its proper divisors (4259697595).

21122203205 is an equidigital number, since it uses as much as digits as its factorization.

21122203205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5876163.

The product of its (nonzero) digits is 480, while the sum is 20.

Adding to 21122203205 its reverse (50230222112), we get a palindrome (71352425317).

The spelling of 21122203205 in words is "twenty-one billion, one hundred twenty-two million, two hundred three thousand, two hundred five".