235982121209881 has 4 divisors (see below), whose sum is σ = 239981818179600. Its totient is φ = 231982424240164.

The previous prime is 235982121209839. The next prime is 235982121209911. The reversal of 235982121209881 is 188902121289532.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 235982121209881 - 2¹⁹ = 235982120685593 is a prime.

It is a super-2 number, since 2×235982121209881² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (235982121201881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1999848484771 + ... + 1999848484888.

It is an arithmetic number, because the mean of its divisors is an integer number (59995454544900).

Almost surely, 2^{235982121209881} is an apocalyptic number.

It is an amenable number.

235982121209881 is a deficient number, since it is larger than the sum of its proper divisors (3999696969719).

235982121209881 is an equidigital number, since it uses as much as digits as its factorization.

235982121209881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3999696969718.

The product of its (nonzero) digits is 9953280, while the sum is 61.

The spelling of 235982121209881 in words is "two hundred thirty-five trillion, nine hundred eighty-two billion, one hundred twenty-one million, two hundred nine thousand, eight hundred eighty-one".