21110310303221 has 8 divisors (see below), whose sum is σ = 22603240379160. Its totient is φ = 19645285462528.

The previous prime is 21110310303211. The next prime is 21110310303287. The reversal of 21110310303221 is 12230301301112.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 4642021066225 + 16468289236996 = 2154535^2 + 4058114^2 .

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 21110310303221 - 2³⁴ = 21093130434037 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21110310303193 and 21110310303202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21110310303211) 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, 6976307246 + ... + 6976310271.

It is an arithmetic number, because the mean of its divisors is an integer number (2825405047395).

Almost surely, 2^{21110310303221} is an apocalyptic number.

It is an amenable number.

21110310303221 is a deficient number, since it is larger than the sum of its proper divisors (1492930075939).

21110310303221 is a wasteful number, since it uses less digits than its factorization.

21110310303221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13952617623.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 21110310303221 its reverse (12230301301112), we get a palindrome (33340611604333).

The spelling of 21110310303221 in words is "twenty-one trillion, one hundred ten billion, three hundred ten million, three hundred three thousand, two hundred twenty-one".