12121221020202 has 48 divisors (see below), whose sum is σ = 31319428233600. Its totient is φ = 3312631830816.

The previous prime is 12121221020191. The next prime is 12121221020203. The reversal of 12121221020202 is 20202012212121.

It is a happy number.

12121221020202 is a `hidden beast` number, since 1 + 21 + 212 + 210 + 20 + 202 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (12121221020203) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2091305077 + ... + 2091310872.

It is an arithmetic number, because the mean of its divisors is an integer number (652488088200).

Almost surely, 2^{12121221020202} is an apocalyptic number.

12121221020202 is an abundant number, since it is smaller than the sum of its proper divisors (19198207213398).

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

12121221020202 is a wasteful number, since it uses less digits than its factorization.

12121221020202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4182615987 (or 4182615984 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 12121221020202 its reverse (20202012212121), we get a palindrome (32323233232323).

The spelling of 12121221020202 in words is "twelve trillion, one hundred twenty-one billion, two hundred twenty-one million, twenty thousand, two hundred two".