221203231452 has 96 divisors (see below), whose sum is σ = 663508733440. Its totient is φ = 63200905776.

The previous prime is 221203231421. The next prime is 221203231559. The reversal of 221203231452 is 254132302122.

221203231452 is a `hidden beast` number, since 2 + 2 + 1 + 203 + 2 + 3 + 1 + 452 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1744918 + ... + 1867389.

Almost surely, 2^221203231452 is an apocalyptic number.

It is an amenable number.

221203231452 is an abundant number, since it is smaller than the sum of its proper divisors (442305501988).

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

221203231452 is an equidigital number, since it uses as much as digits as its factorization.

221203231452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3612339 (or 3612319 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

Adding to 221203231452 its reverse (254132302122), we get a palindrome (475335533574).

The spelling of 221203231452 in words is "two hundred twenty-one billion, two hundred three million, two hundred thirty-one thousand, four hundred fifty-two".