221404222452 has 96 divisors (see below), whose sum is σ = 610873933824. Its totient is φ = 61075411200.

The previous prime is 221404222423. The next prime is 221404222493. The reversal of 221404222452 is 254222404122.

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, 1023688 + ... + 1220960.

It is an arithmetic number, because the mean of its divisors is an integer number (6363270144).

Almost surely, 2^221404222452 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221404222452, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (305436966912).

221404222452 is an abundant number, since it is smaller than the sum of its proper divisors (389469711372).

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

221404222452 is a wasteful number, since it uses less digits than its factorization.

221404222452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197749 (or 197747 counting only the distinct ones).

The product of its (nonzero) digits is 20480, while the sum is 30.

Adding to 221404222452 its reverse (254222404122), we get a palindrome (475626626574).

The spelling of 221404222452 in words is "two hundred twenty-one billion, four hundred four million, two hundred twenty-two thousand, four hundred fifty-two".