121212111904 has 48 divisors (see below), whose sum is σ = 257310587520. Its totient is φ = 55874914560.

The previous prime is 121212111899. The next prime is 121212111931. The reversal of 121212111904 is 409111212121.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 157737 + ... + 517015.

It is an arithmetic number, because the mean of its divisors is an integer number (5360637240).

Almost surely, 2^121212111904 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121212111904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (128655293760).

121212111904 is an abundant number, since it is smaller than the sum of its proper divisors (136098475616).

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

121212111904 is a wasteful number, since it uses less digits than its factorization.

121212111904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 360113 (or 360105 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 25.

The spelling of 121212111904 in words is "one hundred twenty-one billion, two hundred twelve million, one hundred eleven thousand, nine hundred four".