320021111 has 4 divisors (see below), whose sum is σ = 320312352. Its totient is φ = 319729872.

The previous prime is 320021101. The next prime is 320021131. The reversal of 320021111 is 111120023.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 111120023 = 7 ⋅15874289.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-320021111 is a prime.

It is a super-2 number, since 2×320021111² = 204827022971348642, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 320021092 and 320021101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320021101) 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, 143966 + ... + 146171.

It is an arithmetic number, because the mean of its divisors is an integer number (80078088).

Almost surely, 2^320021111 is an apocalyptic number.

320021111 is a deficient number, since it is larger than the sum of its proper divisors (291241).

320021111 is a wasteful number, since it uses less digits than its factorization.

320021111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 291240.

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

The square root of 320021111 is about 17889.1338806550. The cubic root of 320021111 is about 684.0054197158.

Adding to 320021111 its reverse (111120023), we get a palindrome (431141134).

The spelling of 320021111 in words is "three hundred twenty million, twenty-one thousand, one hundred eleven".