21213404433404 has 24 divisors (see below), whose sum is σ = 39480350026320. Its totient is φ = 9938801551616.

The previous prime is 21213404433283. The next prime is 21213404433427. The reversal of 21213404433404 is 40433440431212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 687125159 + ... + 687156030.

It is an arithmetic number, because the mean of its divisors is an integer number (1645014584430).

Almost surely, 2^{21213404433404} is an apocalyptic number.

It is an amenable number.

21213404433404 is a deficient number, since it is larger than the sum of its proper divisors (18266945592916).

21213404433404 is a wasteful number, since it uses less digits than its factorization.

21213404433404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1374281437 (or 1374281435 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 35.

Adding to 21213404433404 its reverse (40433440431212), we get a palindrome (61646844864616).

The spelling of 21213404433404 in words is "twenty-one trillion, two hundred thirteen billion, four hundred four million, four hundred thirty-three thousand, four hundred four".