21220001200 has 60 divisors (see below), whose sum is σ = 52166701048. Its totient is φ = 8290598400.

The previous prime is 21220001197. The next prime is 21220001213. The reversal of 21220001200 is 210002212.

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 11 ways as a sum of consecutive naturals, for example, 599661 + ... + 634060.

Almost surely, 2^21220001200 is an apocalyptic number.

21220001200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21220001200 is an abundant number, since it is smaller than the sum of its proper divisors (30946699848).

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

21220001200 is a wasteful number, since it uses less digits than its factorization.

21220001200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1233782 (or 1233771 counting only the distinct ones).

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

Adding to 21220001200 its reverse (210002212), we get a palindrome (21430003412).

The spelling of 21220001200 in words is "twenty-one billion, two hundred twenty million, one thousand, two hundred".