2161620405304 has 16 divisors (see below), whose sum is σ = 4266356063400. Its totient is φ = 1023925455072.

The previous prime is 2161620405293. The next prime is 2161620405349. The reversal of 2161620405304 is 4035040261612.

It is a super-3 number, since 3×2161620405304³ (a number of 38 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2161620405304.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7110593287 + ... + 7110593590.

Almost surely, 2^{2161620405304} is an apocalyptic number.

It is an amenable number.

2161620405304 is a deficient number, since it is larger than the sum of its proper divisors (2104735658096).

2161620405304 is a wasteful number, since it uses less digits than its factorization.

2161620405304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14221186902 (or 14221186898 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 34.

Adding to 2161620405304 its reverse (4035040261612), we get a palindrome (6196660666916).

The spelling of 2161620405304 in words is "two trillion, one hundred sixty-one billion, six hundred twenty million, four hundred five thousand, three hundred four".