21002400455304 has 64 divisors (see below), whose sum is σ = 53302285117440. Its totient is φ = 6894678415680.

The previous prime is 21002400455251. The next prime is 21002400455383. The reversal of 21002400455304 is 40355400420012.

It is a super-2 number, since 2×21002400455304² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5259937 + ... + 8346959.

It is an arithmetic number, because the mean of its divisors is an integer number (832848204960).

Almost surely, 2^{21002400455304} is an apocalyptic number.

21002400455304 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21002400455304 is an abundant number, since it is smaller than the sum of its proper divisors (32299884662136).

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

21002400455304 is a wasteful number, since it uses less digits than its factorization.

21002400455304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3091330 (or 3091326 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 30.

Adding to 21002400455304 its reverse (40355400420012), we get a palindrome (61357800875316).

The spelling of 21002400455304 in words is "twenty-one trillion, two billion, four hundred million, four hundred fifty-five thousand, three hundred four".