2120021111 has 8 divisors (see below), whose sum is σ = 2286285120. Its totient is φ = 1954212192.

The previous prime is 2120021107. The next prime is 2120021119. The reversal of 2120021111 is 1111200212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2120021111 - 2² = 2120021107 is a prime.

It is a super-2 number, since 2×2120021111² = 8988979022171348642, 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 = 2120021092 and 2120021101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2120021119) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 104060 + ... + 122753.

It is an arithmetic number, because the mean of its divisors is an integer number (285785640).

Almost surely, 2^2120021111 is an apocalyptic number.

2120021111 is a deficient number, since it is larger than the sum of its proper divisors (166264009).

2120021111 is a wasteful number, since it uses less digits than its factorization.

2120021111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227545.

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 2120021111 is about 46043.6869831251. The cubic root of 2120021111 is about 1284.6359218271.

Adding to 2120021111 its reverse (1111200212), we get a palindrome (3231221323).

The spelling of 2120021111 in words is "two billion, one hundred twenty million, twenty-one thousand, one hundred eleven".