113258123821 has 4 divisors (see below), whose sum is σ = 114530687100. Its totient is φ = 111985560544.

The previous prime is 113258123813. The next prime is 113258123831. The reversal of 113258123821 is 128321852311.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 128321852311 = 29 ⋅4424891459.

It can be written as a sum of positive squares in 2 ways, for example, as 12587718025 + 100670405796 = 112195^2 + 317286^2 .

It is a cyclic number.

It is not a de Polignac number, because 113258123821 - 2³ = 113258123813 is a prime.

It is a super-2 number, since 2×113258123821² (a number of 23 digits) 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 (113258123831) 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, 636281506 + ... + 636281683.

It is an arithmetic number, because the mean of its divisors is an integer number (28632671775).

Almost surely, 2^113258123821 is an apocalyptic number.

It is an amenable number.

113258123821 is a deficient number, since it is larger than the sum of its proper divisors (1272563279).

113258123821 is an equidigital number, since it uses as much as digits as its factorization.

113258123821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1272563278.

The product of its digits is 23040, while the sum is 37.

The spelling of 113258123821 in words is "one hundred thirteen billion, two hundred fifty-eight million, one hundred twenty-three thousand, eight hundred twenty-one".