21213405331264 has 28 divisors (see below), whose sum is σ = 42095524140000. Its totient is φ = 10606659091328.

The previous prime is 21213405331231. The next prime is 21213405331333. The reversal of 21213405331264 is 46213350431212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19791387 + ... + 20835685.

Almost surely, 2^{21213405331264} is an apocalyptic number.

It is an amenable number.

21213405331264 is a deficient number, since it is larger than the sum of its proper divisors (20882118808736).

21213405331264 is a wasteful number, since it uses less digits than its factorization.

21213405331264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1361710 (or 1361700 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 37.

Adding to 21213405331264 its reverse (46213350431212), we get a palindrome (67426755762476).

The spelling of 21213405331264 in words is "twenty-one trillion, two hundred thirteen billion, four hundred five million, three hundred thirty-one thousand, two hundred sixty-four".