21320352525400 has 96 divisors (see below), whose sum is σ = 49883552159040. Its totient is φ = 8474266460160.

The previous prime is 21320352525383. The next prime is 21320352525403. The reversal of 21320352525400 is 452525302312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21320352525403) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 33537297 + ... + 34167103.

It is an arithmetic number, because the mean of its divisors is an integer number (519620334990).

Almost surely, 2^{21320352525400} is an apocalyptic number.

21320352525400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21320352525400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24941776079520).

21320352525400 is an abundant number, since it is smaller than the sum of its proper divisors (28563199633640).

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

21320352525400 is a wasteful number, since it uses less digits than its factorization.

21320352525400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 630893 (or 630884 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 34.

Adding to 21320352525400 its reverse (452525302312), we get a palindrome (21772877827712).

The spelling of 21320352525400 in words is "twenty-one trillion, three hundred twenty billion, three hundred fifty-two million, five hundred twenty-five thousand, four hundred".