231201021111221 has 16 divisors (see below), whose sum is σ = 266536236158976. Its totient is φ = 196448897321136.

The previous prime is 231201021111199. The next prime is 231201021111233. The reversal of 231201021111221 is 122111120102132.

It is a cyclic number.

It is not a de Polignac number, because 231201021111221 - 2⁴⁶ = 160832276933557 is a prime.

It is a super-3 number, since 3×231201021111221³ (a number of 44 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 231201021111193 and 231201021111202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231201021111121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 269021591 + ... + 269879636.

It is an arithmetic number, because the mean of its divisors is an integer number (16658514759936).

Almost surely, 2^{231201021111221} is an apocalyptic number.

It is an amenable number.

231201021111221 is a deficient number, since it is larger than the sum of its proper divisors (35335215047755).

231201021111221 is a wasteful number, since it uses less digits than its factorization.

231201021111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 538901768.

The product of its (nonzero) digits is 96, while the sum is 20.

Adding to 231201021111221 its reverse (122111120102132), we get a palindrome (353312141213353).

The spelling of 231201021111221 in words is "two hundred thirty-one trillion, two hundred one billion, twenty-one million, one hundred eleven thousand, two hundred twenty-one".