221221002122 has 64 divisors (see below), whose sum is σ = 364277606400. Its totient is φ = 100356480000.

The previous prime is 221221002059. The next prime is 221221002199. The reversal of 221221002122 is 221200122122.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 221221002122.

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, 84401972 + ... + 84404592.

It is an arithmetic number, because the mean of its divisors is an integer number (5691837600).

Almost surely, 2^221221002122 is an apocalyptic number.

221221002122 is a deficient number, since it is larger than the sum of its proper divisors (143056604278).

221221002122 is a wasteful number, since it uses less digits than its factorization.

221221002122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3263.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 221221002122 its reverse (221200122122), we get a palindrome (442421124244).

The spelling of 221221002122 in words is "two hundred twenty-one billion, two hundred twenty-one million, two thousand, one hundred twenty-two".