21903493772 has 6 divisors (see below), whose sum is σ = 38331114108. Its totient is φ = 10951746884.

The previous prime is 21903493769. The next prime is 21903493789. The reversal of 21903493772 is 27739430912.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2737936718 + ... + 2737936725.

It is an arithmetic number, because the mean of its divisors is an integer number (6388519018).

Almost surely, 2^21903493772 is an apocalyptic number.

It is an amenable number.

21903493772 is a deficient number, since it is larger than the sum of its proper divisors (16427620336).

21903493772 is a wasteful number, since it uses less digits than its factorization.

21903493772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5475873447 (or 5475873445 counting only the distinct ones).

The product of its (nonzero) digits is 571536, while the sum is 47.

The spelling of 21903493772 in words is "twenty-one billion, nine hundred three million, four hundred ninety-three thousand, seven hundred seventy-two".