2261513021 has 4 divisors (see below), whose sum is σ = 2304183132. Its totient is φ = 2218842912.

The previous prime is 2261513017. The next prime is 2261513027. The reversal of 2261513021 is 1203151622.

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

It can be written as a sum of positive squares in 2 ways, for example, as 917484100 + 1344028921 = 30290^2 + 36661^2 .

It is a cyclic number.

It is not a de Polignac number, because 2261513021 - 2² = 2261513017 is a prime.

It is a super-2 number, since 2×2261513021² = 10228882288305092882, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2261513027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21334976 + ... + 21335081.

It is an arithmetic number, because the mean of its divisors is an integer number (576045783).

Almost surely, 2^2261513021 is an apocalyptic number.

It is an amenable number.

2261513021 is a deficient number, since it is larger than the sum of its proper divisors (42670111).

2261513021 is an equidigital number, since it uses as much as digits as its factorization.

2261513021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42670110.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 2261513021 is about 47555.3679514732. The cubic root of 2261513021 is about 1312.6019069597.

Adding to 2261513021 its reverse (1203151622), we get a palindrome (3464664643).

The spelling of 2261513021 in words is "two billion, two hundred sixty-one million, five hundred thirteen thousand, twenty-one".