21012101303 has 4 divisors (see below), whose sum is σ = 22248107280. Its totient is φ = 19776095328.

The previous prime is 21012101281. The next prime is 21012101323. The reversal of 21012101303 is 30310121012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21012101303 - 2²² = 21007906999 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 (21012101323) 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 3 ways as a sum of consecutive naturals, for example, 618002963 + ... + 618002996.

It is an arithmetic number, because the mean of its divisors is an integer number (5562026820).

Almost surely, 2^21012101303 is an apocalyptic number.

21012101303 is a deficient number, since it is larger than the sum of its proper divisors (1236005977).

21012101303 is a wasteful number, since it uses less digits than its factorization.

21012101303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1236005976.

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 21012101303 its reverse (30310121012), we get a palindrome (51322222315).

The spelling of 21012101303 in words is "twenty-one billion, twelve million, one hundred one thousand, three hundred three".