2113343021 has 4 divisors (see below), whose sum is σ = 2113434972. Its totient is φ = 2113251072.

The previous prime is 2113343009. The next prime is 2113343033. The reversal of 2113343021 is 1203433112.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is an interprime number because it is at equal distance from previous prime (2113343009) and next prime (2113343033).

It can be written as a sum of positive squares in 2 ways, for example, as 410872900 + 1702470121 = 20270^2 + 41261^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2113343021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2113342984 and 2113343002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2113343081) 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, 22091 + ... + 68663.

It is an arithmetic number, because the mean of its divisors is an integer number (528358743).

Almost surely, 2^2113343021 is an apocalyptic number.

It is an amenable number.

2113343021 is a deficient number, since it is larger than the sum of its proper divisors (91951).

2113343021 is an equidigital number, since it uses as much as digits as its factorization.

2113343021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91950.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 2113343021 is about 45971.1107218436. The cubic root of 2113343021 is about 1283.2856305576.

Adding to 2113343021 its reverse (1203433112), we get a palindrome (3316776133).

Subtracting from 2113343021 its reverse (1203433112), we obtain a palindrome (909909909).

The spelling of 2113343021 in words is "two billion, one hundred thirteen million, three hundred forty-three thousand, twenty-one".