121122221004 has 72 divisors (see below), whose sum is σ = 313219565568. Its totient is φ = 39447410400.

The previous prime is 121122220963. The next prime is 121122221063. The reversal of 121122221004 is 400122221121.

121122221004 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 932229 + ... + 1054179.

It is an arithmetic number, because the mean of its divisors is an integer number (4350271744).

Almost surely, 2^121122221004 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 121122221004, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (156609782784).

121122221004 is an abundant number, since it is smaller than the sum of its proper divisors (192097344564).

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

121122221004 is a wasteful number, since it uses less digits than its factorization.

121122221004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122595 (or 122590 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 121122221004 its reverse (400122221121), we get a palindrome (521244442125).

The spelling of 121122221004 in words is "one hundred twenty-one billion, one hundred twenty-two million, two hundred twenty-one thousand, four".