21455033200 has 60 divisors (see below), whose sum is σ = 51559802640. Its totient is φ = 8579668480.

The previous prime is 21455033161. The next prime is 21455033233. The reversal of 21455033200 is 233055412.

It is a super-2 number, since 2×21455033200² (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 a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2827812 + ... + 2835388.

It is an arithmetic number, because the mean of its divisors is an integer number (859330044).

Almost surely, 2^21455033200 is an apocalyptic number.

21455033200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21455033200 is an abundant number, since it is smaller than the sum of its proper divisors (30104769440).

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

21455033200 is a wasteful number, since it uses less digits than its factorization.

21455033200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14674 (or 14663 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 25.

Adding to 21455033200 its reverse (233055412), we get a palindrome (21688088612).

The spelling of 21455033200 in words is "twenty-one billion, four hundred fifty-five million, thirty-three thousand, two hundred".