120021311 has 4 divisors (see below), whose sum is σ = 121711824. Its totient is φ = 118330800.

The previous prime is 120021289. The next prime is 120021323. The reversal of 120021311 is 113120021.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 120021311 - 2¹⁰ = 120020287 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 120021292 and 120021301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120021371) 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, 845150 + ... + 845291.

It is an arithmetic number, because the mean of its divisors is an integer number (30427956).

Almost surely, 2^120021311 is an apocalyptic number.

120021311 is a deficient number, since it is larger than the sum of its proper divisors (1690513).

120021311 is an equidigital number, since it uses as much as digits as its factorization.

120021311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1690512.

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 120021311 is about 10955.4238165395. The cubic root of 120021311 is about 493.2716117186.

Adding to 120021311 its reverse (113120021), we get a palindrome (233141332).

The spelling of 120021311 in words is "one hundred twenty million, twenty-one thousand, three hundred eleven".