2120400111 has 4 divisors (see below), whose sum is σ = 2827200152. Its totient is φ = 1413600072.

The previous prime is 2120400091. The next prime is 2120400131. The reversal of 2120400111 is 1110040212.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (2120400091) and next prime (2120400131).

It is not a de Polignac number, because 2120400111 - 2⁹ = 2120399599 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 (2120400131) 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, 353400016 + ... + 353400021.

It is an arithmetic number, because the mean of its divisors is an integer number (706800038).

Almost surely, 2^2120400111 is an apocalyptic number.

2120400111 is a deficient number, since it is larger than the sum of its proper divisors (706800041).

2120400111 is an equidigital number, since it uses as much as digits as its factorization.

2120400111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 706800040.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 2120400111 is about 46047.8024557090. The cubic root of 2120400111 is about 1284.7124694931.

Adding to 2120400111 its reverse (1110040212), we get a palindrome (3230440323).

The spelling of 2120400111 in words is "two billion, one hundred twenty million, four hundred thousand, one hundred eleven".