115213621 has 4 divisors (see below), whose sum is σ = 115235244. Its totient is φ = 115192000.

The previous prime is 115213603. The next prime is 115213643. The reversal of 115213621 is 126312511.

It is a happy number.

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 95062500 + 20151121 = 9750^2 + 4489^2 .

It is a cyclic number.

It is not a de Polignac number, because 115213621 - 2⁷ = 115213493 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 115213592 and 115213601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115214621) 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, 3471 + ... + 15571.

It is an arithmetic number, because the mean of its divisors is an integer number (28808811).

Almost surely, 2^115213621 is an apocalyptic number.

It is an amenable number.

115213621 is a deficient number, since it is larger than the sum of its proper divisors (21623).

115213621 is an equidigital number, since it uses as much as digits as its factorization.

115213621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21622.

The product of its digits is 360, while the sum is 22.

The square root of 115213621 is about 10733.7608041171. The cubic root of 115213621 is about 486.5953361293.

The spelling of 115213621 in words is "one hundred fifteen million, two hundred thirteen thousand, six hundred twenty-one".