121211212120 has 64 divisors (see below), whose sum is σ = 293187340800. Its totient is φ = 44955365760.

The previous prime is 121211212103. The next prime is 121211212289. The reversal of 121211212120 is 21212112121.

It is a junction number, because it is equal to n+sod(n) for n = 121211212094 and 121211212103.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1660966 + ... + 1732405.

It is an arithmetic number, because the mean of its divisors is an integer number (4581052200).

Almost surely, 2^121211212120 is an apocalyptic number.

121211212120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121211212120 is an abundant number, since it is smaller than the sum of its proper divisors (171976128680).

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

121211212120 is a wasteful number, since it uses less digits than its factorization.

121211212120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3393448 (or 3393444 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 121211212120 its reverse (21212112121), we get a palindrome (142423324241).

Subtracting from 121211212120 its reverse (21212112121), we obtain a palindrome (99999099999).

The spelling of 121211212120 in words is "one hundred twenty-one billion, two hundred eleven million, two hundred twelve thousand, one hundred twenty".