1221122200210 has 24 divisors (see below), whose sum is σ = 2416005413388. Its totient is φ = 444044436000.

The previous prime is 1221122200201. The next prime is 1221122200211. The reversal of 1221122200210 is 120022211221.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1212639237601 + 8482962609 = 1101199^2 + 92103^2 .

It is a super-2 number, since 2×1221122200210² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1221122200211) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 504594741 + ... + 504597160.

Almost surely, 2^{1221122200210} is an apocalyptic number.

1221122200210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221122200210 is a deficient number, since it is larger than the sum of its proper divisors (1194883213178).

1221122200210 is a wasteful number, since it uses less digits than its factorization.

1221122200210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1009191930 (or 1009191919 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 1221122200210 its reverse (120022211221), we get a palindrome (1341144411431).

The spelling of 1221122200210 in words is "one trillion, two hundred twenty-one billion, one hundred twenty-two million, two hundred thousand, two hundred ten".