21113233233421 has 16 divisors (see below), whose sum is σ = 25399609488000. Its totient is φ = 17144424335808.

The previous prime is 21113233233353. The next prime is 21113233233457. The reversal of 21113233233421 is 12433233231112.

It is not a de Polignac number, because 21113233233421 - 2¹⁹ = 21113232709133 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21113233233121) 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, 15272655 + ... + 16597603.

It is an arithmetic number, because the mean of its divisors is an integer number (1587475593000).

Almost surely, 2^{21113233233421} is an apocalyptic number.

It is an amenable number.

21113233233421 is a deficient number, since it is larger than the sum of its proper divisors (4286376254579).

21113233233421 is a wasteful number, since it uses less digits than its factorization.

21113233233421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1444788.

The product of its digits is 15552, while the sum is 31.

Adding to 21113233233421 its reverse (12433233231112), we get a palindrome (33546466464533).

The spelling of 21113233233421 in words is "twenty-one trillion, one hundred thirteen billion, two hundred thirty-three million, two hundred thirty-three thousand, four hundred twenty-one".