2120521111 has 4 divisors (see below), whose sum is σ = 2125862872. Its totient is φ = 2115179352.

The previous prime is 2120521103. The next prime is 2120521121. The reversal of 2120521111 is 1111250212.

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 2120521111 - 2³ = 2120521103 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2120521121) 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, 2670285 + ... + 2671078.

It is an arithmetic number, because the mean of its divisors is an integer number (531465718).

Almost surely, 2^2120521111 is an apocalyptic number.

2120521111 is a deficient number, since it is larger than the sum of its proper divisors (5341761).

2120521111 is an equidigital number, since it uses as much as digits as its factorization.

2120521111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5341760.

The product of its (nonzero) digits is 40, while the sum is 16.

The square root of 2120521111 is about 46049.1162890234. The cubic root of 2120521111 is about 1284.7369062729.

Adding to 2120521111 its reverse (1111250212), we get a palindrome (3231771323).

The spelling of 2120521111 in words is "two billion, one hundred twenty million, five hundred twenty-one thousand, one hundred eleven".