21297916303 has 16 divisors (see below), whose sum is σ = 23009817600. Its totient is φ = 19652703840.

The previous prime is 21297916301. The next prime is 21297916331. The reversal of 21297916303 is 30361979212.

It is a cyclic number.

It is not a de Polignac number, because 21297916303 - 2¹ = 21297916301 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21297916303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21297916301) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 808108 + ... + 834046.

It is an arithmetic number, because the mean of its divisors is an integer number (1438113600).

Almost surely, 2^21297916303 is an apocalyptic number.

21297916303 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21297916303 is a deficient number, since it is larger than the sum of its proper divisors (1711901297).

21297916303 is a wasteful number, since it uses less digits than its factorization.

21297916303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27222.

The product of its (nonzero) digits is 122472, while the sum is 43.

The spelling of 21297916303 in words is "twenty-one billion, two hundred ninety-seven million, nine hundred sixteen thousand, three hundred three".