21221043300423 has 6 divisors (see below), whose sum is σ = 30652618100624. Its totient is φ = 14147362200276.

The previous prime is 21221043300407. The next prime is 21221043300437. The reversal of 21221043300423 is 32400334012212.

21221043300423 is a `hidden beast` number, since 2 + 1 + 221 + 0 + 433 + 0 + 0 + 4 + 2 + 3 = 666.

It is not a de Polignac number, because 21221043300423 - 2⁴ = 21221043300407 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 (21221043300623) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1178946850015 + ... + 1178946850032.

Almost surely, 2^{21221043300423} is an apocalyptic number.

21221043300423 is a deficient number, since it is larger than the sum of its proper divisors (9431574800201).

21221043300423 is a wasteful number, since it uses less digits than its factorization.

21221043300423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2357893700053 (or 2357893700050 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

Adding to 21221043300423 its reverse (32400334012212), we get a palindrome (53621377312635).

The spelling of 21221043300423 in words is "twenty-one trillion, two hundred twenty-one billion, forty-three million, three hundred thousand, four hundred twenty-three".