21404333040 has 80 divisors (see below), whose sum is σ = 66697376928. Its totient is φ = 5678235648.

The previous prime is 21404333039. The next prime is 21404333057. The reversal of 21404333040 is 4033340412.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 21404333040.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 184729 + ... + 277368.

Almost surely, 2^21404333040 is an apocalyptic number.

21404333040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21404333040 is an abundant number, since it is smaller than the sum of its proper divisors (45293043888).

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

21404333040 is a wasteful number, since it uses less digits than its factorization.

21404333040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 462306 (or 462300 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 24.

Adding to 21404333040 its reverse (4033340412), we get a palindrome (25437673452).

The spelling of 21404333040 in words is "twenty-one billion, four hundred four million, three hundred thirty-three thousand, forty".