21221020233223 has 16 divisors (see below), whose sum is σ = 22087768809600. Its totient is φ = 20363475363840.

The previous prime is 21221020233167. The next prime is 21221020233233. The reversal of 21221020233223 is 32233202012212.

It is a cyclic number.

It is not a de Polignac number, because 21221020233223 - 2⁴¹ = 19021996977671 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221020233233) 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, 3990693 + ... + 7639873.

It is an arithmetic number, because the mean of its divisors is an integer number (1380485550600).

Almost surely, 2^{21221020233223} is an apocalyptic number.

21221020233223 is a deficient number, since it is larger than the sum of its proper divisors (866748576377).

21221020233223 is a wasteful number, since it uses less digits than its factorization.

21221020233223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3650442.

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 21221020233223 its reverse (32233202012212), we get a palindrome (53454222245435).

The spelling of 21221020233223 in words is "twenty-one trillion, two hundred twenty-one billion, twenty million, two hundred thirty-three thousand, two hundred twenty-three".