21322115400 has 96 divisors (see below), whose sum is σ = 69577466400. Its totient is φ = 5386636800.

The previous prime is 21322115383. The next prime is 21322115401. The reversal of 21322115400 is 451122312.

It is not an unprimeable number, because it can be changed into a prime (21322115401) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 923781 + ... + 946580.

It is an arithmetic number, because the mean of its divisors is an integer number (724765275).

Almost surely, 2^21322115400 is an apocalyptic number.

21322115400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21322115400 is an abundant number, since it is smaller than the sum of its proper divisors (48255351000).

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

21322115400 is a wasteful number, since it uses less digits than its factorization.

21322115400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1870399 (or 1870390 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

Adding to 21322115400 its reverse (451122312), we get a palindrome (21773237712).

The spelling of 21322115400 in words is "twenty-one billion, three hundred twenty-two million, one hundred fifteen thousand, four hundred".