2131201111 has 8 divisors (see below), whose sum is σ = 2307158784. Its totient is φ = 1956960480.

The previous prime is 2131201081. The next prime is 2131201117. The reversal of 2131201111 is 1111021312.

It is a happy number.

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 2131201111 - 2⁷ = 2131200983 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2131201091 and 2131201100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2131201117) 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, 426676 + ... + 431641.

It is an arithmetic number, because the mean of its divisors is an integer number (288394848).

Almost surely, 2^2131201111 is an apocalyptic number.

2131201111 is a deficient number, since it is larger than the sum of its proper divisors (175957673).

2131201111 is a wasteful number, since it uses less digits than its factorization.

2131201111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 858521.

The product of its (nonzero) digits is 12, while the sum is 13.

The square root of 2131201111 is about 46164.9337809554. The cubic root of 2131201111 is about 1286.8901535857.

Adding to 2131201111 its reverse (1111021312), we get a palindrome (3242222423).

It can be divided in two parts, 2131201 and 111, that added together give a palindrome (2131312).

The spelling of 2131201111 in words is "two billion, one hundred thirty-one million, two hundred one thousand, one hundred eleven".