21143453200 has 60 divisors (see below), whose sum is σ = 51409240848. Its totient is φ = 8355472000.

The previous prime is 21143453173. The next prime is 21143453209. The reversal of 21143453200 is 235434112.

It is a super-2 number, since 2×21143453200² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (21143453209) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 285226 + ... + 351625.

Almost surely, 2^21143453200 is an apocalyptic number.

21143453200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21143453200 is an abundant number, since it is smaller than the sum of its proper divisors (30265787648).

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

21143453200 is a wasteful number, since it uses less digits than its factorization.

21143453200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 636952 (or 636941 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

Adding to 21143453200 its reverse (235434112), we get a palindrome (21378887312).

The spelling of 21143453200 in words is "twenty-one billion, one hundred forty-three million, four hundred fifty-three thousand, two hundred".