231551501021101 has 24 divisors (see below), whose sum is σ = 254463665625000. Its totient is φ = 210408996962304.

The previous prime is 231551501021089. The next prime is 231551501021107. The reversal of 231551501021101 is 101120105155132.

It can be written as a sum of positive squares in 12 ways, for example, as 28656375517225 + 202895125503876 = 5353165^2 + 14244126^2 .

It is not a de Polignac number, because 231551501021101 - 2³⁵ = 231517141282733 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 231551501021101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231551501021107) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 261455805 + ... + 262339933.

It is an arithmetic number, because the mean of its divisors is an integer number (10602652734375).

Almost surely, 2^{231551501021101} is an apocalyptic number.

It is an amenable number.

231551501021101 is a deficient number, since it is larger than the sum of its proper divisors (22912164603899).

231551501021101 is a wasteful number, since it uses less digits than its factorization.

231551501021101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 915441 (or 915424 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 28.

Adding to 231551501021101 its reverse (101120105155132), we get a palindrome (332671606176233).

The spelling of 231551501021101 in words is "two hundred thirty-one trillion, five hundred fifty-one billion, five hundred one million, twenty-one thousand, one hundred one".