1022221221200 has 30 divisors (see below), whose sum is σ = 2455886484894. Its totient is φ = 408888488320.

The previous prime is 1022221221181. The next prime is 1022221221223. The reversal of 1022221221200 is 21221222201.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 14671023376 + 1007550197824 = 121124^2 + 1003768^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1277776127 + ... + 1277776926.

Almost surely, 2^{1022221221200} is an apocalyptic number.

1022221221200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1022221221200 is an abundant number, since it is smaller than the sum of its proper divisors (1433665263694).

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

1022221221200 is a wasteful number, since it uses less digits than its factorization.

1022221221200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2555553071 (or 2555553060 counting only the distinct ones).

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

Adding to 1022221221200 its reverse (21221222201), we get a palindrome (1043442443401).

It can be divided in two parts, 1022221 and 221200, that added together give a palindrome (1243421).

The spelling of 1022221221200 in words is "one trillion, twenty-two billion, two hundred twenty-one million, two hundred twenty-one thousand, two hundred".