21402304021233 has 6 divisors (see below), whose sum is σ = 30914439141794. Its totient is φ = 14268202680816.

The previous prime is 21402304021169. The next prime is 21402304021249. The reversal of 21402304021233 is 33212040320412.

21402304021233 is a `hidden beast` number, since 2 + 1 + 4 + 0 + 23 + 0 + 402 + 1 + 233 = 666.

It can be written as a sum of positive squares in only one way, i.e., 12643592743089 + 8758711278144 = 3555783^2 + 2959512^2 .

It is not a de Polignac number, because 21402304021233 - 2⁶ = 21402304021169 is a prime.

It is a super-2 number, since 2×21402304021233² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21402304021197 and 21402304021206.

It is not an unprimeable number, because it can be changed into a prime (21402304021633) 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, 1189016890060 + ... + 1189016890077.

Almost surely, 2^{21402304021233} is an apocalyptic number.

It is an amenable number.

21402304021233 is a deficient number, since it is larger than the sum of its proper divisors (9512135120561).

21402304021233 is a wasteful number, since it uses less digits than its factorization.

21402304021233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2378033780143 (or 2378033780140 counting only the distinct ones).

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

Adding to 21402304021233 its reverse (33212040320412), we get a palindrome (54614344341645).

The spelling of 21402304021233 in words is "twenty-one trillion, four hundred two billion, three hundred four million, twenty-one thousand, two hundred thirty-three".