231521530234011 has 8 divisors (see below), whose sum is σ = 310400872947984. Its totient is φ = 153494937171360.

The previous prime is 231521530233881. The next prime is 231521530234039. The reversal of 231521530234011 is 110432035125132.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 231521530234011 - 2¹⁸ = 231521529971867 is a prime.

It is a super-2 number, since 2×231521530234011² (a number of 30 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (231521530232011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 213187412196 + ... + 213187413281.

It is an arithmetic number, because the mean of its divisors is an integer number (38800109118498).

Almost surely, 2^{231521530234011} is an apocalyptic number.

231521530234011 is a deficient number, since it is larger than the sum of its proper divisors (78879342713973).

231521530234011 is a wasteful number, since it uses less digits than its factorization.

231521530234011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 426374825661.

The product of its (nonzero) digits is 21600, while the sum is 33.

Adding to 231521530234011 its reverse (110432035125132), we get a palindrome (341953565359143).

The spelling of 231521530234011 in words is "two hundred thirty-one trillion, five hundred twenty-one billion, five hundred thirty million, two hundred thirty-four thousand, eleven".