221225121064 has 16 divisors (see below), whose sum is σ = 422623463220. Its totient is φ = 108525530880.

The previous prime is 221225121053. The next prime is 221225121083. The reversal of 221225121064 is 460121522122.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 202807916964 + 18417204100 = 450342^2 + 135710^2 .

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, 260878257 + ... + 260879104.

Almost surely, 2^221225121064 is an apocalyptic number.

It is an amenable number.

221225121064 is a deficient number, since it is larger than the sum of its proper divisors (201398342156).

221225121064 is a wasteful number, since it uses less digits than its factorization.

221225121064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 521757420 (or 521757416 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 28.

Adding to 221225121064 its reverse (460121522122), we get a palindrome (681346643186).

The spelling of 221225121064 in words is "two hundred twenty-one billion, two hundred twenty-five million, one hundred twenty-one thousand, sixty-four".