21310300030221 has 24 divisors (see below), whose sum is σ = 30901421018520. Its totient is φ = 14151557682816.

The previous prime is 21310300030213. The next prime is 21310300030231. The reversal of 21310300030221 is 12203000301312.

21310300030221 is a `hidden beast` number, since 2 + 1 + 310 + 30 + 0 + 0 + 302 + 21 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 174673007721 + 21135627022500 = 417939^2 + 4597350^2 .

It is not a de Polignac number, because 21310300030221 - 2³ = 21310300030213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21310300030194 and 21310300030203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21310300030231) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13009675 + ... + 14555831.

It is an arithmetic number, because the mean of its divisors is an integer number (1287559209105).

Almost surely, 2^{21310300030221} is an apocalyptic number.

It is an amenable number.

21310300030221 is a deficient number, since it is larger than the sum of its proper divisors (9591120988299).

21310300030221 is a wasteful number, since it uses less digits than its factorization.

21310300030221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1552125 (or 1552122 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 21310300030221 its reverse (12203000301312), we get a palindrome (33513300331533).

The spelling of 21310300030221 in words is "twenty-one trillion, three hundred ten billion, three hundred million, thirty thousand, two hundred twenty-one".