21122201200 has 60 divisors (see below), whose sum is σ = 53416954360. Its totient is φ = 8004199680.

The previous prime is 21122201197. The next prime is 21122201227. The reversal of 21122201200 is 210222112.

It is a happy number.

It is a super-2 number, since 2×21122201200² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

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, 1382019 + ... + 1397218.

Almost surely, 2^21122201200 is an apocalyptic number.

21122201200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21122201200 is an abundant number, since it is smaller than the sum of its proper divisors (32294753160).

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

21122201200 is a wasteful number, since it uses less digits than its factorization.

21122201200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2779274 (or 2779263 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21122201200 its reverse (210222112), we get a palindrome (21332423312).

The spelling of 21122201200 in words is "twenty-one billion, one hundred twenty-two million, two hundred one thousand, two hundred".