221451200436 has 24 divisors (see below), whose sum is σ = 518021039200. Its totient is φ = 73631128032.

The previous prime is 221451200413. The next prime is 221451200437. The reversal of 221451200436 is 634002154122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221451200437) 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, 23237386 + ... + 23246913.

Almost surely, 2^221451200436 is an apocalyptic number.

It is an amenable number.

221451200436 is an abundant number, since it is smaller than the sum of its proper divisors (296569838764).

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

221451200436 is a wasteful number, since it uses less digits than its factorization.

221451200436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46484703 (or 46484701 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

Adding to 221451200436 its reverse (634002154122), we get a palindrome (855453354558).

The spelling of 221451200436 in words is "two hundred twenty-one billion, four hundred fifty-one million, two hundred thousand, four hundred thirty-six".