21223003230221 has 16 divisors (see below), whose sum is σ = 22871671918704. Its totient is φ = 19576641552384.

The previous prime is 21223003230203. The next prime is 21223003230227. The reversal of 21223003230221 is 12203230032212.

It can be written as a sum of positive squares in 8 ways, for example, as 64052017225 + 21158951212996 = 253085^2 + 4599886^2 .

It is a cyclic number.

It is not a de Polignac number, because 21223003230221 - 2¹⁴ = 21223003213837 is a prime.

It is a super-2 number, since 2×21223003230221² (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 (21223003230227) 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, 206814701 + ... + 206917293.

It is an arithmetic number, because the mean of its divisors is an integer number (1429479494919).

Almost surely, 2^{21223003230221} is an apocalyptic number.

It is an amenable number.

21223003230221 is a deficient number, since it is larger than the sum of its proper divisors (1648668688483).

21223003230221 is a wasteful number, since it uses less digits than its factorization.

21223003230221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113680.

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 21223003230221 its reverse (12203230032212), we get a palindrome (33426233262433).

The spelling of 21223003230221 in words is "twenty-one trillion, two hundred twenty-three billion, three million, two hundred thirty thousand, two hundred twenty-one".