21220121303 has 8 divisors (see below), whose sum is σ = 21295062672. Its totient is φ = 21145251456.

The previous prime is 21220121297. The next prime is 21220121317. The reversal of 21220121303 is 30312102212.

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 21220121303 - 2²⁴ = 21203344087 is a prime.

It is a super-2 number, since 2×21220121303² (a number of 21 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 (21220121203) 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 7 ways as a sum of consecutive naturals, for example, 615776 + ... + 649322.

It is an arithmetic number, because the mean of its divisors is an integer number (2661882834).

Almost surely, 2^21220121303 is an apocalyptic number.

21220121303 is a deficient number, since it is larger than the sum of its proper divisors (74941369).

21220121303 is a wasteful number, since it uses less digits than its factorization.

21220121303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35761.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21220121303 its reverse (30312102212), we get a palindrome (51532223515).

The spelling of 21220121303 in words is "twenty-one billion, two hundred twenty million, one hundred twenty-one thousand, three hundred three".