21205453031200 has 144 divisors (see below), whose sum is σ = 51956682059520. Its totient is φ = 8451261342720.

The previous prime is 21205453031107. The next prime is 21205453031219. The reversal of 21205453031200 is 213035450212.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 543445291 + ... + 543484309.

It is an arithmetic number, because the mean of its divisors is an integer number (360810292080).

Almost surely, 2^{21205453031200} is an apocalyptic number.

21205453031200 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 21205453031200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25978341029760).

21205453031200 is an abundant number, since it is smaller than the sum of its proper divisors (30751229028320).

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

21205453031200 is a wasteful number, since it uses less digits than its factorization.

21205453031200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41499 (or 41486 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 28.

Adding to 21205453031200 its reverse (213035450212), we get a palindrome (21418488481412).

The spelling of 21205453031200 in words is "twenty-one trillion, two hundred five billion, four hundred fifty-three million, thirty-one thousand, two hundred".