21013121303 has 8 divisors (see below), whose sum is σ = 22331292480. Its totient is φ = 19704072960.

The previous prime is 21013121293. The next prime is 21013121323. The reversal of 21013121303 is 30312131012.

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

It is a cyclic number.

It is not a de Polignac number, because 21013121303 - 2⁸ = 21013121047 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21013121323) 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, 2275958 + ... + 2285171.

It is an arithmetic number, because the mean of its divisors is an integer number (2791411560).

Almost surely, 2^21013121303 is an apocalyptic number.

21013121303 is a deficient number, since it is larger than the sum of its proper divisors (1318171177).

21013121303 is a wasteful number, since it uses less digits than its factorization.

21013121303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4561417.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 21013121303 its reverse (30312131012), we get a palindrome (51325252315).

The spelling of 21013121303 in words is "twenty-one billion, thirteen million, one hundred twenty-one thousand, three hundred three".