121221202122 has 48 divisors (see below), whose sum is σ = 272415365352. Its totient is φ = 38925705600.

The previous prime is 121221202121. The next prime is 121221202169. The reversal of 121221202122 is 221202122121.

It is a happy number.

121221202122 is a `hidden beast` number, since 121 + 221 + 202 + 122 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 115171318161 + 6049883961 = 339369^2 + 77781^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 121221202095 and 121221202104.

It is not an unprimeable number, because it can be changed into a prime (121221202121) 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, 833793 + ... + 968324.

Almost surely, 2^121221202122 is an apocalyptic number.

121221202122 is an abundant number, since it is smaller than the sum of its proper divisors (151194163230).

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

121221202122 is a wasteful number, since it uses less digits than its factorization.

121221202122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1802263 (or 1802260 counting only the distinct ones).

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

Adding to 121221202122 its reverse (221202122121), we get a palindrome (342423324243).

It can be divided in two parts, 121 and 221202122, that multiplied together give a palindrome (26765456762).

The spelling of 121221202122 in words is "one hundred twenty-one billion, two hundred twenty-one million, two hundred two thousand, one hundred twenty-two".