21022212021200 has 120 divisors (see below), whose sum is σ = 56266480615800. Its totient is φ = 7494390650880.

The previous prime is 21022212021133. The next prime is 21022212021253. The reversal of 21022212021200 is 212021222012.

It is a happy number.

It can be written as a sum of positive squares in 12 ways, for example, as 9393048076864 + 11629163944336 = 3064808^2 + 3410156^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 69551495 + ... + 69853094.

It is an arithmetic number, because the mean of its divisors is an integer number (468887338465).

Almost surely, 2^{21022212021200} is an apocalyptic number.

21022212021200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21022212021200 is an abundant number, since it is smaller than the sum of its proper divisors (35244268594600).

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

21022212021200 is a wasteful number, since it uses less digits than its factorization.

21022212021200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139404649 (or 139404638 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21022212021200 its reverse (212021222012), we get a palindrome (21234233243212).

The spelling of 21022212021200 in words is "twenty-one trillion, twenty-two billion, two hundred twelve million, twenty-one thousand, two hundred".