21011011013303 has 4 divisors (see below), whose sum is σ = 21013472192160. Its totient is φ = 21008549834448.

The previous prime is 21011011013281. The next prime is 21011011013323. The reversal of 21011011013303 is 30331011011012.

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 21011011013303 - 2¹⁴ = 21011010996919 is a prime.

It is a super-2 number, since 2×21011011013303² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011011013323) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1230576623 + ... + 1230593696.

It is an arithmetic number, because the mean of its divisors is an integer number (5253368048040).

Almost surely, 2^{21011011013303} is an apocalyptic number.

21011011013303 is a deficient number, since it is larger than the sum of its proper divisors (2461178857).

21011011013303 is an equidigital number, since it uses as much as digits as its factorization.

21011011013303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2461178856.

The product of its (nonzero) digits is 54, while the sum is 17.

Adding to 21011011013303 its reverse (30331011011012), we get a palindrome (51342022024315).

The spelling of 21011011013303 in words is "twenty-one trillion, eleven billion, eleven million, thirteen thousand, three hundred three".