21103202310221 has 32 divisors (see below), whose sum is σ = 22163474016000. Its totient is φ = 20055322298880.

The previous prime is 21103202310199. The next prime is 21103202310257. The reversal of 21103202310221 is 12201320230112.

It is a cyclic number.

It is not a de Polignac number, because 21103202310221 - 2¹⁴ = 21103202293837 is a prime.

It is a super-2 number, since 2×21103202310221² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21103202310193 and 21103202310202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21103202360221) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3872855105 + ... + 3872860553.

It is an arithmetic number, because the mean of its divisors is an integer number (692608563000).

Almost surely, 2^{21103202310221} is an apocalyptic number.

It is an amenable number.

21103202310221 is a deficient number, since it is larger than the sum of its proper divisors (1060271705779).

21103202310221 is a wasteful number, since it uses less digits than its factorization.

21103202310221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7349.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 21103202310221 its reverse (12201320230112), we get a palindrome (33304522540333).

The spelling of 21103202310221 in words is "twenty-one trillion, one hundred three billion, two hundred two million, three hundred ten thousand, two hundred twenty-one".