21100212303 has 16 divisors (see below), whose sum is σ = 30293429760. Its totient is φ = 13014951296.

The previous prime is 21100212271. The next prime is 21100212361. The reversal of 21100212303 is 30321200112.

It is a cyclic number.

It is not a de Polignac number, because 21100212303 - 2⁵ = 21100212271 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21100216303) 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 15 ways as a sum of consecutive naturals, for example, 3503175 + ... + 3509192.

It is an arithmetic number, because the mean of its divisors is an integer number (1893339360).

Almost surely, 2^21100212303 is an apocalyptic number.

21100212303 is a deficient number, since it is larger than the sum of its proper divisors (9193217457).

21100212303 is a wasteful number, since it uses less digits than its factorization.

21100212303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7012446.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21100212303 its reverse (30321200112), we get a palindrome (51421412415).

The spelling of 21100212303 in words is "twenty-one billion, one hundred million, two hundred twelve thousand, three hundred three".