21221221023223 has 12 divisors (see below), whose sum is σ = 23031063842040. Its totient is φ = 19544600783136.

The previous prime is 21221221023173. The next prime is 21221221023241. The reversal of 21221221023223 is 32232012212212.

It is a de Polignac number, because none of the positive numbers 2^k-21221221023223 is a prime.

It is a super-2 number, since 2×21221221023223² (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 (21221225023223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 141651268 + ... + 141801001.

It is an arithmetic number, because the mean of its divisors is an integer number (1919255320170).

Almost surely, 2^{21221221023223} is an apocalyptic number.

21221221023223 is a deficient number, since it is larger than the sum of its proper divisors (1809842818817).

21221221023223 is a wasteful number, since it uses less digits than its factorization.

21221221023223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 283452738 (or 283452725 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 21221221023223 its reverse (32232012212212), we get a palindrome (53453233235435).

The spelling of 21221221023223 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred twenty-one million, twenty-three thousand, two hundred twenty-three".