21903962823 has 12 divisors (see below), whose sum is σ = 31688271160. Its totient is φ = 14579927856.

The previous prime is 21903962809. The next prime is 21903962863. The reversal of 21903962823 is 32826930912.

It is a happy number.

21903962823 is a `hidden beast` number, since 2 + 19 + 0 + 3 + 9 + 628 + 2 + 3 = 666.

It is not a de Polignac number, because 21903962823 - 2¹⁰ = 21903961799 is a prime.

It is a super-2 number, since 2×21903962823² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21903962863) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 1886728 + ... + 1898301.

Almost surely, 2^21903962823 is an apocalyptic number.

21903962823 is a deficient number, since it is larger than the sum of its proper divisors (9784308337).

21903962823 is a wasteful number, since it uses less digits than its factorization.

21903962823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3785678 (or 3785675 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 45.

The spelling of 21903962823 in words is "twenty-one billion, nine hundred three million, nine hundred sixty-two thousand, eight hundred twenty-three".