21222221300 has 36 divisors (see below), whose sum is σ = 52631110560. Its totient is φ = 7276189920.

The previous prime is 21222221299. The next prime is 21222221309. The reversal of 21222221300 is 312222212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222221309) 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, 15158030 + ... + 15159429.

Almost surely, 2^21222221300 is an apocalyptic number.

21222221300 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21222221300 is an abundant number, since it is smaller than the sum of its proper divisors (31408889260).

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

21222221300 is a wasteful number, since it uses less digits than its factorization.

21222221300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30317480 (or 30317473 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 21222221300 its reverse (312222212), we get a palindrome (21534443512).

The spelling of 21222221300 in words is "twenty-one billion, two hundred twenty-two million, two hundred twenty-one thousand, three hundred".