22001021200 has 30 divisors (see below), whose sum is σ = 52857454394. Its totient is φ = 8800408320.

The previous prime is 22001021173. The next prime is 22001021213. The reversal of 22001021200 is 212010022.

It can be written as a sum of positive squares in 3 ways, for example, as 5179968784 + 16821052416 = 71972^2 + 129696^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

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 5 ways as a sum of consecutive naturals, for example, 27500877 + ... + 27501676.

Almost surely, 2^22001021200 is an apocalyptic number.

22001021200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22001021200 is an abundant number, since it is smaller than the sum of its proper divisors (30856433194).

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

22001021200 is a wasteful number, since it uses less digits than its factorization.

22001021200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55002571 (or 55002560 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 22001021200 its reverse (212010022), we get a palindrome (22213031222).

The spelling of 22001021200 in words is "twenty-two billion, one million, twenty-one thousand, two hundred".