1001222021200 has 60 divisors (see below), whose sum is σ = 2413121306428. Its totient is φ = 399209241600.

The previous prime is 1001222021167. The next prime is 1001222021203. The reversal of 1001222021200 is 21202221001.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 381424819216 + 619797201984 = 617596^2 + 787272^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001222021203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3873291 + ... + 4123690.

Almost surely, 2^{1001222021200} is an apocalyptic number.

1001222021200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1001222021200 is an abundant number, since it is smaller than the sum of its proper divisors (1411899285228).

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

1001222021200 is a wasteful number, since it uses less digits than its factorization.

1001222021200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7997312 (or 7997301 counting only the distinct ones).

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

Adding to 1001222021200 its reverse (21202221001), we get a palindrome (1022424242201).

The spelling of 1001222021200 in words is "one trillion, one billion, two hundred twenty-two million, twenty-one thousand, two hundred".