221616306051204 has 12 divisors (see below), whose sum is σ = 517104714119504. Its totient is φ = 73872102017064.

The previous prime is 221616306051169. The next prime is 221616306051251. The reversal of 221616306051204 is 402150603616122.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×221616306051204² (a number of 29 digits) contains 22 as substring.

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, 9234012752122 + ... + 9234012752145.

Almost surely, 2^{221616306051204} is an apocalyptic number.

It is an amenable number.

221616306051204 is an abundant number, since it is smaller than the sum of its proper divisors (295488408068300).

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

221616306051204 is a wasteful number, since it uses less digits than its factorization.

221616306051204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18468025504274 (or 18468025504272 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 39.

Adding to 221616306051204 its reverse (402150603616122), we get a palindrome (623766909667326).

The spelling of 221616306051204 in words is "two hundred twenty-one trillion, six hundred sixteen billion, three hundred six million, fifty-one thousand, two hundred four".