21604212403161 has 8 divisors (see below), whose sum is σ = 29293847326560. Its totient is φ = 14158692874272.

The previous prime is 21604212403157. The next prime is 21604212403199. The reversal of 21604212403161 is 16130421240612.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21604212403161 - 2² = 21604212403157 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21604212003161) 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, 61028848420 + ... + 61028848773.

It is an arithmetic number, because the mean of its divisors is an integer number (3661730915820).

Almost surely, 2^{21604212403161} is an apocalyptic number.

It is an amenable number.

21604212403161 is a deficient number, since it is larger than the sum of its proper divisors (7689634923399).

21604212403161 is a wasteful number, since it uses less digits than its factorization.

21604212403161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122057697255.

The product of its (nonzero) digits is 13824, while the sum is 33.

Adding to 21604212403161 its reverse (16130421240612), we get a palindrome (37734633643773).

The spelling of 21604212403161 in words is "twenty-one trillion, six hundred four billion, two hundred twelve million, four hundred three thousand, one hundred sixty-one".