121212321110202 has 64 divisors (see below), whose sum is σ = 277324272578304. Its totient is φ = 34598652856320.

The previous prime is 121212321110173. The next prime is 121212321110203. The reversal of 121212321110202 is 202011123212121.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (121212321110203) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1008085078 + ... + 1008205310.

It is an arithmetic number, because the mean of its divisors is an integer number (4333191759036).

Almost surely, 2^{121212321110202} is an apocalyptic number.

121212321110202 is an abundant number, since it is smaller than the sum of its proper divisors (156111951468102).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121212321110202 is a wasteful number, since it uses less digits than its factorization.

121212321110202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143223.

The product of its (nonzero) digits is 192, while the sum is 21.

Adding to 121212321110202 its reverse (202011123212121), we get a palindrome (323223444322323).

The spelling of 121212321110202 in words is "one hundred twenty-one trillion, two hundred twelve billion, three hundred twenty-one million, one hundred ten thousand, two hundred two".