21323121200 has 30 divisors (see below), whose sum is σ = 51228799644. Its totient is φ = 8529248320.

The previous prime is 21323121191. The next prime is 21323121217. The reversal of 21323121200 is 212132312.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 26653502 + ... + 26654301.

Almost surely, 2^21323121200 is an apocalyptic number.

21323121200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21323121200 is an abundant number, since it is smaller than the sum of its proper divisors (29905678444).

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

21323121200 is a wasteful number, since it uses less digits than its factorization.

21323121200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53307821 (or 53307810 counting only the distinct ones).

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

Adding to 21323121200 its reverse (212132312), we get a palindrome (21535253512).

The spelling of 21323121200 in words is "twenty-one billion, three hundred twenty-three million, one hundred twenty-one thousand, two hundred".