120021423990 has 128 divisors (see below), whose sum is σ = 320360406912. Its totient is φ = 28585820160.

The previous prime is 120021423989. The next prime is 120021424021. The reversal of 120021423990 is 99324120021.

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, 2588854 + ... + 2634806.

It is an arithmetic number, because the mean of its divisors is an integer number (2502815679).

Almost surely, 2^120021423990 is an apocalyptic number.

120021423990 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 120021423990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (160180203456).

120021423990 is an abundant number, since it is smaller than the sum of its proper divisors (200338982922).

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

120021423990 is a wasteful number, since it uses less digits than its factorization.

120021423990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46194.

The product of its (nonzero) digits is 7776, while the sum is 33.

The spelling of 120021423990 in words is "one hundred twenty billion, twenty-one million, four hundred twenty-three thousand, nine hundred ninety".