2131111021 has 8 divisors (see below), whose sum is σ = 2295941760. Its totient is φ = 1966408752.

The previous prime is 2131111019. The next prime is 2131111039. The reversal of 2131111021 is 1201111312.

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 2131111021 - 2¹ = 2131111019 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 = 2131110992 and 2131111010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2131111001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3840 + ... + 65398.

It is an arithmetic number, because the mean of its divisors is an integer number (286992720).

Almost surely, 2^2131111021 is an apocalyptic number.

It is an amenable number.

2131111021 is a deficient number, since it is larger than the sum of its proper divisors (164830739).

2131111021 is a wasteful number, since it uses less digits than its factorization.

2131111021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64235.

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

The square root of 2131111021 is about 46163.9580300476. The cubic root of 2131111021 is about 1286.8720202168.

Adding to 2131111021 its reverse (1201111312), we get a palindrome (3332222333).

The spelling of 2131111021 in words is "two billion, one hundred thirty-one million, one hundred eleven thousand, twenty-one".