1210121222121 has 64 divisors (see below), whose sum is σ = 2070164275200. Its totient is φ = 684351488448.

The previous prime is 1210121222113. The next prime is 1210121222137. The reversal of 1210121222121 is 1212221210121.

1210121222121 is a `hidden beast` number, since 1 + 210 + 1 + 212 + 221 + 21 = 666.

It is not a de Polignac number, because 1210121222121 - 2³ = 1210121222113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1210121222094 and 1210121222103.

It is not an unprimeable number, because it can be changed into a prime (1210121222161) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 7144216 + ... + 7311638.

It is an arithmetic number, because the mean of its divisors is an integer number (32346316800).

Almost surely, 2^{1210121222121} is an apocalyptic number.

It is an amenable number.

1210121222121 is a deficient number, since it is larger than the sum of its proper divisors (860043053079).

1210121222121 is a wasteful number, since it uses less digits than its factorization.

1210121222121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167835 (or 167829 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 1210121222121 its reverse (1212221210121), we get a palindrome (2422342432242).

The spelling of 1210121222121 in words is "one trillion, two hundred ten billion, one hundred twenty-one million, two hundred twenty-two thousand, one hundred twenty-one".