21121310221303 has 16 divisors (see below), whose sum is σ = 21597177982464. Its totient is φ = 20651774987520.

The previous prime is 21121310221283. The next prime is 21121310221331. The reversal of 21121310221303 is 30312201312112.

It is a cyclic number.

It is not a de Polignac number, because 21121310221303 - 2²⁵ = 21121276666871 is a prime.

It is a super-2 number, since 2×21121310221303² (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 (21121310221603) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1036608 + ... + 6581578.

It is an arithmetic number, because the mean of its divisors is an integer number (1349823623904).

Almost surely, 2^{21121310221303} is an apocalyptic number.

21121310221303 is a deficient number, since it is larger than the sum of its proper divisors (475867761161).

21121310221303 is a wasteful number, since it uses less digits than its factorization.

21121310221303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5545542.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 21121310221303 its reverse (30312201312112), we get a palindrome (51433511533415).

The spelling of 21121310221303 in words is "twenty-one trillion, one hundred twenty-one billion, three hundred ten million, two hundred twenty-one thousand, three hundred three".