121221200210210 has 16 divisors (see below), whose sum is σ = 224095407956856. Its totient is φ = 47177980622208.

The previous prime is 121221200210189. The next prime is 121221200210267. The reversal of 121221200210210 is 12012002122121.

It can be written as a sum of positive squares in 4 ways, for example, as 82735815221929 + 38485384988281 = 9095923^2 + 6203659^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 163812432347 + ... + 163812433086.

Almost surely, 2^{121221200210210} is an apocalyptic number.

121221200210210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121221200210210 is a deficient number, since it is larger than the sum of its proper divisors (102874207746646).

121221200210210 is a wasteful number, since it uses less digits than its factorization.

121221200210210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327624865477.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 121221200210210 its reverse (12012002122121), we get a palindrome (133233202332331).

The spelling of 121221200210210 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, two hundred million, two hundred ten thousand, two hundred ten".