221221452 has 36 divisors (see below), whose sum is σ = 539617400. Its totient is φ = 70532352.

The previous prime is 221221447. The next prime is 221221457. The reversal of 221221452 is 254122122.

221221452 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (221221447) and next prime (221221457).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221221457) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11077 + ... + 23772.

Almost surely, 2^221221452 is an apocalyptic number.

It is an amenable number.

221221452 is an abundant number, since it is smaller than the sum of its proper divisors (318395948).

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

221221452 is a wasteful number, since it uses less digits than its factorization.

221221452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34902 (or 34877 counting only the distinct ones).

The product of its digits is 640, while the sum is 21.

The square root of 221221452 is about 14873.5151191640. The cubic root of 221221452 is about 604.7962358217.

Adding to 221221452 its reverse (254122122), we get a palindrome (475343574).

The spelling of 221221452 in words is "two hundred twenty-one million, two hundred twenty-one thousand, four hundred fifty-two".