21210321400 has 48 divisors (see below), whose sum is σ = 49323617640. Its totient is φ = 8482473600.

The previous prime is 21210321383. The next prime is 21210321413. The reversal of 21210321400 is 412301212.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1868542 + ... + 1879858.

Almost surely, 2^21210321400 is an apocalyptic number.

21210321400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21210321400 is an abundant number, since it is smaller than the sum of its proper divisors (28113296240).

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

21210321400 is a wasteful number, since it uses less digits than its factorization.

21210321400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20704 (or 20695 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21210321400 its reverse (412301212), we get a palindrome (21622622612).

The spelling of 21210321400 in words is "twenty-one billion, two hundred ten million, three hundred twenty-one thousand, four hundred".