121211212104 has 32 divisors (see below), whose sum is σ = 336697812000. Its totient is φ = 40403737296.

The previous prime is 121211212103. The next prime is 121211212289. The reversal of 121211212104 is 401212112121.

It is a super-2 number, since 2×121211212104² (a number of 23 digits) contains 22 as substring.

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 (121211212103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 280581294 + ... + 280581725.

It is an arithmetic number, because the mean of its divisors is an integer number (10521806625).

Almost surely, 2^121211212104 is an apocalyptic number.

It is an amenable number.

121211212104 is an abundant number, since it is smaller than the sum of its proper divisors (215486599896).

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

121211212104 is a wasteful number, since it uses less digits than its factorization.

121211212104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 561163034 (or 561163024 counting only the distinct ones).

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

Adding to 121211212104 its reverse (401212112121), we get a palindrome (522423324225).

The spelling of 121211212104 in words is "one hundred twenty-one billion, two hundred eleven million, two hundred twelve thousand, one hundred four".