1221100202 has 16 divisors (see below), whose sum is σ = 2093928000. Its totient is φ = 523175328.

The previous prime is 1221100193. The next prime is 1221100207. The reversal of 1221100202 is 2020011221.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1221100207) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 46049 + ... + 67547.

It is an arithmetic number, because the mean of its divisors is an integer number (130870500).

Almost surely, 2^1221100202 is an apocalyptic number.

1221100202 is a deficient number, since it is larger than the sum of its proper divisors (872827798).

1221100202 is a wasteful number, since it uses less digits than its factorization.

1221100202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25565.

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

The square root of 1221100202 is about 34944.2441898519. The cubic root of 1221100202 is about 1068.8508354320.

Adding to 1221100202 its reverse (2020011221), we get a palindrome (3241111423).

The spelling of 1221100202 in words is "one billion, two hundred twenty-one million, one hundred thousand, two hundred two".