1221102220210 has 16 divisors (see below), whose sum is σ = 2198060568792. Its totient is φ = 488423872000.

The previous prime is 1221102220199. The next prime is 1221102220211. The reversal of 1221102220210 is 120222011221.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1177982451801 + 43119768409 = 1085349^2 + 207653^2 .

It is not an unprimeable number, because it can be changed into a prime (1221102220211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1823551 + ... + 2401570.

Almost surely, 2^{1221102220210} is an apocalyptic number.

1221102220210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221102220210 is a deficient number, since it is larger than the sum of its proper divisors (976958348582).

1221102220210 is a wasteful number, since it uses less digits than its factorization.

1221102220210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4254029.

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

Adding to 1221102220210 its reverse (120222011221), we get a palindrome (1341324231431).

The spelling of 1221102220210 in words is "one trillion, two hundred twenty-one billion, one hundred two million, two hundred twenty thousand, two hundred ten".