21120012303 has 24 divisors (see below), whose sum is σ = 30539974032. Its totient is φ = 12976823808.

The previous prime is 21120012259. The next prime is 21120012307. The reversal of 21120012303 is 30321002112.

It is not a de Polignac number, because 21120012303 - 2⁸ = 21120012047 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120012307) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 299175 + ... + 362967.

It is an arithmetic number, because the mean of its divisors is an integer number (1272498918).

Almost surely, 2^21120012303 is an apocalyptic number.

21120012303 is a deficient number, since it is larger than the sum of its proper divisors (9419961729).

21120012303 is a wasteful number, since it uses less digits than its factorization.

21120012303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64475 (or 64462 counting only the distinct ones).

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

Adding to 21120012303 its reverse (30321002112), we get a palindrome (51441014415).

The spelling of 21120012303 in words is "twenty-one billion, one hundred twenty million, twelve thousand, three hundred three".