1221200210 has 32 divisors (see below), whose sum is σ = 2232725040. Its totient is φ = 480826368.

The previous prime is 1221200161. The next prime is 1221200273. The reversal of 1221200210 is 120021221.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 484132009 + 737068201 = 22003^2 + 27149^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1221200191 and 1221200200.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 446126 + ... + 448854.

Almost surely, 2^1221200210 is an apocalyptic number.

1221200210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221200210 is a deficient number, since it is larger than the sum of its proper divisors (1011524830).

1221200210 is a wasteful number, since it uses less digits than its factorization.

1221200210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3422.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 1221200210 is about 34945.6751258292. The cubic root of 1221200210 is about 1068.8800142322.

Adding to 1221200210 its reverse (120021221), we get a palindrome (1341221431).

The spelling of 1221200210 in words is "one billion, two hundred twenty-one million, two hundred thousand, two hundred ten".