221125216 has 24 divisors (see below), whose sum is σ = 468828864. Its totient is φ = 102057600.

The previous prime is 221125199. The next prime is 221125253. The reversal of 221125216 is 612521122.

It is a super-2 number, since 2×221125216² = 97792722302093312, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 265360 + ... + 266191.

It is an arithmetic number, because the mean of its divisors is an integer number (19534536).

Almost surely, 2^221125216 is an apocalyptic number.

221125216 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

221125216 is an abundant number, since it is smaller than the sum of its proper divisors (247703648).

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

221125216 is a wasteful number, since it uses less digits than its factorization.

221125216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 531574 (or 531566 counting only the distinct ones).

The product of its digits is 480, while the sum is 22.

The square root of 221125216 is about 14870.2796207738. The cubic root of 221125216 is about 604.7085233931.

Adding to 221125216 its reverse (612521122), we get a palindrome (833646338).

The spelling of 221125216 in words is "two hundred twenty-one million, one hundred twenty-five thousand, two hundred sixteen".