21360273600 has 84 divisors (see below), whose sum is σ = 70079513384. Its totient is φ = 5696071680.

The previous prime is 21360273593. The next prime is 21360273601. The reversal of 21360273600 is 637206312.

It is a super-2 number, since 2×21360273600² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (21360273601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2220229 + ... + 2229828.

Almost surely, 2^21360273600 is an apocalyptic number.

21360273600 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21360273600 is an abundant number, since it is smaller than the sum of its proper divisors (48719239784).

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

21360273600 is a wasteful number, since it uses less digits than its factorization.

21360273600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4450082 (or 4450067 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 30.

Adding to 21360273600 its reverse (637206312), we get a palindrome (21997479912).

The spelling of 21360273600 in words is "twenty-one billion, three hundred sixty million, two hundred seventy-three thousand, six hundred".