21227104400 has 60 divisors (see below), whose sum is σ = 53998024932. Its totient is φ = 7991377920.

The previous prime is 21227104357. The next prime is 21227104427. The reversal of 21227104400 is 440172212.

It can be written as a sum of positive squares in 6 ways, for example, as 5607424 + 21221496976 = 2368^2 + 145676^2 .

It is a super-2 number, since 2×21227104400² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

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, 1554017 + ... + 1567616.

Almost surely, 2^21227104400 is an apocalyptic number.

21227104400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21227104400 is an abundant number, since it is smaller than the sum of its proper divisors (32770920532).

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

21227104400 is a wasteful number, since it uses less digits than its factorization.

21227104400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3121668 (or 3121657 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 23.

Adding to 21227104400 its reverse (440172212), we get a palindrome (21667276612).

The spelling of 21227104400 in words is "twenty-one billion, two hundred twenty-seven million, one hundred four thousand, four hundred".