21226327400 has 48 divisors (see below), whose sum is σ = 51496927200. Its totient is φ = 8121375680.

The previous prime is 21226327391. The next prime is 21226327501. The reversal of 21226327400 is 472362212.

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, 2302610 + ... + 2311809.

It is an arithmetic number, because the mean of its divisors is an integer number (1072852650).

Almost surely, 2^21226327400 is an apocalyptic number.

21226327400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21226327400 is an abundant number, since it is smaller than the sum of its proper divisors (30270599800).

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

21226327400 is a wasteful number, since it uses less digits than its factorization.

21226327400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4614458 (or 4614449 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 29.

Adding to 21226327400 its reverse (472362212), we get a palindrome (21698689612).

The spelling of 21226327400 in words is "twenty-one billion, two hundred twenty-six million, three hundred twenty-seven thousand, four hundred".