21204031400 has 48 divisors (see below), whose sum is σ = 49400007840. Its totient is φ = 8464299200.

The previous prime is 21204031397. The next prime is 21204031411. The reversal of 21204031400 is 413040212.

It is a super-2 number, since 2×21204031400² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9764 + ... + 206163.

It is an arithmetic number, because the mean of its divisors is an integer number (1029166830).

Almost surely, 2^21204031400 is an apocalyptic number.

21204031400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21204031400 is an abundant number, since it is smaller than the sum of its proper divisors (28195976440).

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

21204031400 is a wasteful number, since it uses less digits than its factorization.

21204031400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216434 (or 216425 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 21204031400 its reverse (413040212), we get a palindrome (21617071612).

The spelling of 21204031400 in words is "twenty-one billion, two hundred four million, thirty-one thousand, four hundred".