121211021112 has 64 divisors (see below), whose sum is σ = 310838929920. Its totient is φ = 39369735168.

The previous prime is 121211021089. The next prime is 121211021137. The reversal of 121211021112 is 211120112121.

It is a happy number.

It is a super-2 number, since 2×121211021112² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 121211021091 and 121211021100.

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, 19368 + ... + 492744.

It is an arithmetic number, because the mean of its divisors is an integer number (4856858280).

Almost surely, 2^121211021112 is an apocalyptic number.

121211021112 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121211021112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (155419464960).

121211021112 is an abundant number, since it is smaller than the sum of its proper divisors (189627908808).

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

121211021112 is a wasteful number, since it uses less digits than its factorization.

121211021112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 473660 (or 473656 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 121211021112 its reverse (211120112121), we get a palindrome (332331133233).

The spelling of 121211021112 in words is "one hundred twenty-one billion, two hundred eleven million, twenty-one thousand, one hundred twelve".