2113442021 has 2 divisors, whose sum is σ = 2113442022. Its totient is φ = 2113442020.

The previous prime is 2113441973. The next prime is 2113442039. The reversal of 2113442021 is 1202443112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1567051396 + 546390625 = 39586^2 + 23375^2 .

It is a cyclic number.

It is not a de Polignac number, because 2113442021 - 2¹⁸ = 2113179877 is a prime.

It is a super-2 number, since 2×2113442021² = 8933274352257128882, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2113441984 and 2113442002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2113441021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1056721010 + 1056721011.

It is an arithmetic number, because the mean of its divisors is an integer number (1056721011).

Almost surely, 2^2113442021 is an apocalyptic number.

It is an amenable number.

2113442021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2113442021 is an equidigital number, since it uses as much as digits as its factorization.

2113442021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 2113442021 is about 45972.1874724273. The cubic root of 2113442021 is about 1283.3056688401.

Adding to 2113442021 its reverse (1202443112), we get a palindrome (3315885133).

The spelling of 2113442021 in words is "two billion, one hundred thirteen million, four hundred forty-two thousand, twenty-one".