21903964990 has 8 divisors (see below), whose sum is σ = 39427137000. Its totient is φ = 8761585992.

The previous prime is 21903964987. The next prime is 21903964991. The reversal of 21903964990 is 9946930912.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21903964991) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1095198240 + ... + 1095198259.

It is an arithmetic number, because the mean of its divisors is an integer number (4928392125).

Almost surely, 2^21903964990 is an apocalyptic number.

21903964990 is a deficient number, since it is larger than the sum of its proper divisors (17523172010).

21903964990 is a wasteful number, since it uses less digits than its factorization.

21903964990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2190396506.

The product of its (nonzero) digits is 944784, while the sum is 52.

The spelling of 21903964990 in words is "twenty-one billion, nine hundred three million, nine hundred sixty-four thousand, nine hundred ninety".