21230322012200 has 144 divisors (see below), whose sum is σ = 57423368223900. Its totient is φ = 7278458880000.

The previous prime is 21230322012169. The next prime is 21230322012257. The reversal of 21230322012200 is 221022303212.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 14971528921636 + 6258793090564 = 3869306^2 + 2501758^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

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 35 ways as a sum of consecutive naturals, for example, 156742106 + ... + 156877494.

Almost surely, 2^{21230322012200} is an apocalyptic number.

21230322012200 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 21230322012200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28711684111950).

21230322012200 is an abundant number, since it is smaller than the sum of its proper divisors (36193046211700).

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

21230322012200 is a wasteful number, since it uses less digits than its factorization.

21230322012200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151420 (or 151404 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21230322012200 its reverse (221022303212), we get a palindrome (21451344315412).

The spelling of 21230322012200 in words is "twenty-one trillion, two hundred thirty billion, three hundred twenty-two million, twelve thousand, two hundred".