21123322250 has 64 divisors (see below), whose sum is σ = 40433885856. Its totient is φ = 8260096000.

The previous prime is 21123322229. The next prime is 21123322261. The reversal of 21123322250 is 5222332112.

It can be written as a sum of positive squares in 16 ways, for example, as 1788697849 + 19334624401 = 42293^2 + 139049^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3879530 + ... + 3884970.

Almost surely, 2^21123322250 is an apocalyptic number.

21123322250 is a deficient number, since it is larger than the sum of its proper divisors (19310563606).

21123322250 is a wasteful number, since it uses less digits than its factorization.

21123322250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5804 (or 5794 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 23.

Adding to 21123322250 its reverse (5222332112), we get a palindrome (26345654362).

The spelling of 21123322250 in words is "twenty-one billion, one hundred twenty-three million, three hundred twenty-two thousand, two hundred fifty".