231320663416221 has 16 divisors (see below), whose sum is σ = 326870781133824. Its totient is φ = 145008851364864.

The previous prime is 231320663416177. The next prime is 231320663416291. The reversal of 231320663416221 is 122614366023132.

It is a de Polignac number, because none of the positive numbers 2^k-231320663416221 is a prime.

It is a super-3 number, since 3×231320663416221³ (a number of 44 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231320663416291) 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, 2086282780 + ... + 2086393653.

It is an arithmetic number, because the mean of its divisors is an integer number (20429423820864).

Almost surely, 2^{231320663416221} is an apocalyptic number.

It is an amenable number.

231320663416221 is a deficient number, since it is larger than the sum of its proper divisors (95550117717603).

231320663416221 is a wasteful number, since it uses less digits than its factorization.

231320663416221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4172677540.

The product of its (nonzero) digits is 373248, while the sum is 42.

The spelling of 231320663416221 in words is "two hundred thirty-one trillion, three hundred twenty billion, six hundred sixty-three million, four hundred sixteen thousand, two hundred twenty-one".