21113032400 has 60 divisors (see below), whose sum is σ = 52473194700. Its totient is φ = 8153994240.

The previous prime is 21113032399. The next prime is 21113032403. The reversal of 21113032400 is 423031112.

It can be written as a sum of positive squares in 6 ways, for example, as 4003345984 + 17109686416 = 63272^2 + 130804^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21113032403) by changing a digit.

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, 898445 + ... + 921644.

It is an arithmetic number, because the mean of its divisors is an integer number (874553245).

Almost surely, 2^21113032400 is an apocalyptic number.

21113032400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21113032400 is an abundant number, since it is smaller than the sum of its proper divisors (31360162300).

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

21113032400 is a wasteful number, since it uses less digits than its factorization.

21113032400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1820136 (or 1820125 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21113032400 its reverse (423031112), we get a palindrome (21536063512).

The spelling of 21113032400 in words is "twenty-one billion, one hundred thirteen million, thirty-two thousand, four hundred".