231533454223221 has 4 divisors (see below), whose sum is σ = 308711272297632. Its totient is φ = 154355636148812.

The previous prime is 231533454223207. The next prime is 231533454223223. The reversal of 231533454223221 is 122322454335132.

231533454223221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 a cyclic number.

It is not a de Polignac number, because 231533454223221 - 2¹⁰ = 231533454222197 is a prime.

It is a super-2 number, since 2×231533454223221² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231533454223223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38588909037201 + ... + 38588909037206.

It is an arithmetic number, because the mean of its divisors is an integer number (77177818074408).

Almost surely, 2^{231533454223221} is an apocalyptic number.

It is an amenable number.

231533454223221 is a deficient number, since it is larger than the sum of its proper divisors (77177818074411).

231533454223221 is an equidigital number, since it uses as much as digits as its factorization.

231533454223221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77177818074410.

The product of its digits is 1036800, while the sum is 42.

The spelling of 231533454223221 in words is "two hundred thirty-one trillion, five hundred thirty-three billion, four hundred fifty-four million, two hundred twenty-three thousand, two hundred twenty-one".