221521404125122 has 16 divisors (see below), whose sum is σ = 332446927841280. Its totient is φ = 110705771724768.

The previous prime is 221521404125093. The next prime is 221521404125129.

221521404125122 is nontrivially palindromic in base 10.

It is not an unprimeable number, because it can be changed into a prime (221521404125129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40922323 + ... + 46018249.

It is an arithmetic number, because the mean of its divisors is an integer number (20777932990080).

Almost surely, 2^{221521404125122} is an apocalyptic number.

221521404125122 is a deficient number, since it is larger than the sum of its proper divisors (110925523716158).

221521404125122 is a wasteful number, since it uses less digits than its factorization.

221521404125122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5106705.

The product of its (nonzero) digits is 25600, while the sum is 34.

It can be divided in two parts, 22152140 and 4125122, that added together give a palindrome (26277262).

The spelling of 221521404125122 in words is "two hundred twenty-one trillion, five hundred twenty-one billion, four hundred four million, one hundred twenty-five thousand, one hundred twenty-two".