21162506903 has 8 divisors (see below), whose sum is σ = 21855584256. Its totient is φ = 20470080600.

The previous prime is 21162506891. The next prime is 21162506909. The reversal of 21162506903 is 30960526112.

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

It is a cyclic number.

It is not a de Polignac number, because 21162506903 - 2¹⁶ = 21162441367 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21162506909) 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 7 ways as a sum of consecutive naturals, for example, 96251 + ... + 227132.

It is an arithmetic number, because the mean of its divisors is an integer number (2731948032).

Almost surely, 2^21162506903 is an apocalyptic number.

21162506903 is a deficient number, since it is larger than the sum of its proper divisors (693077353).

21162506903 is a wasteful number, since it uses less digits than its factorization.

21162506903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325525.

The product of its (nonzero) digits is 19440, while the sum is 35.

The spelling of 21162506903 in words is "twenty-one billion, one hundred sixty-two million, five hundred six thousand, nine hundred three".