221221222148 has 12 divisors (see below), whose sum is σ = 388458427980. Its totient is φ = 110233099872.

The previous prime is 221221222147. The next prime is 221221222151. The reversal of 221221222148 is 841222122122.

It can be written as a sum of positive squares in 2 ways, for example, as 128026564864 + 93194657284 = 357808^2 + 305278^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 221221222148.

It is not an unprimeable number, because it can be changed into a prime (221221222147) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 94376483 + ... + 94378826.

It is an arithmetic number, because the mean of its divisors is an integer number (32371535665).

Almost surely, 2^221221222148 is an apocalyptic number.

It is an amenable number.

221221222148 is a deficient number, since it is larger than the sum of its proper divisors (167237205832).

221221222148 is a wasteful number, since it uses less digits than its factorization.

221221222148 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188755606 (or 188755604 counting only the distinct ones).

The product of its digits is 4096, while the sum is 29.

The spelling of 221221222148 in words is "two hundred twenty-one billion, two hundred twenty-one million, two hundred twenty-two thousand, one hundred forty-eight".