120021881 has 4 divisors (see below), whose sum is σ = 137167872. Its totient is φ = 102875892.

The previous prime is 120021829. The next prime is 120021893. The reversal of 120021881 is 188120021.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 120021881 - 2⁶ = 120021817 is a prime.

It is a super-2 number, since 2×120021881² = 28810503837556322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (120071881) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8572985 + ... + 8572998.

It is an arithmetic number, because the mean of its divisors is an integer number (34291968).

Almost surely, 2^120021881 is an apocalyptic number.

It is an amenable number.

120021881 is a deficient number, since it is larger than the sum of its proper divisors (17145991).

120021881 is an equidigital number, since it uses as much as digits as its factorization.

120021881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17145990.

The product of its (nonzero) digits is 256, while the sum is 23.

The square root of 120021881 is about 10955.4498310202. The cubic root of 120021881 is about 493.2723925921.

The spelling of 120021881 in words is "one hundred twenty million, twenty-one thousand, eight hundred eighty-one".