231221452 has 24 divisors (see below), whose sum is σ = 504483840. Its totient is φ = 90086160.

The previous prime is 231221411. The next prime is 231221453. The reversal of 231221452 is 254122132.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is not an unprimeable number, because it can be changed into a prime (231221453) 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, 375052 + ... + 375667.

It is an arithmetic number, because the mean of its divisors is an integer number (21020160).

Almost surely, 2^231221452 is an apocalyptic number.

231221452 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

231221452 is an abundant number, since it is smaller than the sum of its proper divisors (273262388).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

231221452 is a wasteful number, since it uses less digits than its factorization.

231221452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 750741 (or 750739 counting only the distinct ones).

The product of its digits is 960, while the sum is 22.

The square root of 231221452 is about 15205.9676443165. The cubic root of 231221452 is about 613.7752539996.

Adding to 231221452 its reverse (254122132), we get a palindrome (485343584).

The spelling of 231221452 in words is "two hundred thirty-one million, two hundred twenty-one thousand, four hundred fifty-two".