121220120319990 has 128 divisors (see below), whose sum is σ = 297812662198272. Its totient is φ = 31563674419200.

The previous prime is 121220120319973. The next prime is 121220120320001. The reversal of 121220120319990 is 99913021022121.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4734963190 + ... + 4734988790.

It is an arithmetic number, because the mean of its divisors is an integer number (2326661423424).

Almost surely, 2^{121220120319990} is an apocalyptic number.

121220120319990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 121220120319990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (148906331099136).

121220120319990 is an abundant number, since it is smaller than the sum of its proper divisors (176592541878282).

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

121220120319990 is a wasteful number, since it uses less digits than its factorization.

121220120319990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33374.

The product of its (nonzero) digits is 34992, while the sum is 42.

The spelling of 121220120319990 in words is "one hundred twenty-one trillion, two hundred twenty billion, one hundred twenty million, three hundred nineteen thousand, nine hundred ninety".