21333403386 has 24 divisors (see below), whose sum is σ = 46414177524. Its totient is φ = 7081626240.

The previous prime is 21333403381. The next prime is 21333403387. The reversal of 21333403386 is 68330433312.

21333403386 is a `hidden beast` number, since 213 + 3 + 3 + 403 + 38 + 6 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 19815911361 + 1517492025 = 140769^2 + 38955^2 .

It is a super-2 number, since 2×21333403386² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21333403386.

It is not an unprimeable number, because it can be changed into a prime (21333403381) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2454561 + ... + 2463236.

Almost surely, 2^21333403386 is an apocalyptic number.

21333403386 is an abundant number, since it is smaller than the sum of its proper divisors (25080774138).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21333403386 is a wasteful number, since it uses less digits than its factorization.

21333403386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4918046 (or 4918043 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 36.

Adding to 21333403386 its reverse (68330433312), we get a palindrome (89663836698).

The spelling of 21333403386 in words is "twenty-one billion, three hundred thirty-three million, four hundred three thousand, three hundred eighty-six".