21012111303 has 8 divisors (see below), whose sum is σ = 28083014400. Its totient is φ = 13974641208.

The previous prime is 21012111277. The next prime is 21012111319. The reversal of 21012111303 is 30311121012.

It is a happy number.

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

It is not a de Polignac number, because 21012111303 - 2⁸ = 21012111047 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012111383) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8356783 + ... + 8359296.

It is an arithmetic number, because the mean of its divisors is an integer number (3510376800).

Almost surely, 2^21012111303 is an apocalyptic number.

21012111303 is a deficient number, since it is larger than the sum of its proper divisors (7070903097).

21012111303 is a wasteful number, since it uses less digits than its factorization.

21012111303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16716501.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 21012111303 its reverse (30311121012), we get a palindrome (51323232315).

The spelling of 21012111303 in words is "twenty-one billion, twelve million, one hundred eleven thousand, three hundred three".