21213334421236 has 24 divisors (see below), whose sum is σ = 37733591006720. Its totient is φ = 10432323871200.

The previous prime is 21213334421231. The next prime is 21213334421239. The reversal of 21213334421236 is 63212443331212.

It is a junction number, because it is equal to n+sod(n) for n = 21213334421195 and 21213334421204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21213334421231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3603781 + ... + 7444051.

Almost surely, 2^{21213334421236} is an apocalyptic number.

It is an amenable number.

21213334421236 is a deficient number, since it is larger than the sum of its proper divisors (16520256585484).

21213334421236 is a wasteful number, since it uses less digits than its factorization.

21213334421236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3862975 (or 3862973 counting only the distinct ones).

The product of its digits is 124416, while the sum is 37.

Adding to 21213334421236 its reverse (63212443331212), we get a palindrome (84425777752448).

The spelling of 21213334421236 in words is "twenty-one trillion, two hundred thirteen billion, three hundred thirty-four million, four hundred twenty-one thousand, two hundred thirty-six".