2161653220004 has 12 divisors (see below), whose sum is σ = 3782921578800. Its totient is φ = 1080818483208.

The previous prime is 2161653219967. The next prime is 2161653220043. The reversal of 2161653220004 is 4000223561612.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1412234 + ... + 2513505.

It is an arithmetic number, because the mean of its divisors is an integer number (315243464900).

Almost surely, 2^{2161653220004} is an apocalyptic number.

It is an amenable number.

2161653220004 is a deficient number, since it is larger than the sum of its proper divisors (1621268358796).

2161653220004 is a wasteful number, since it uses less digits than its factorization.

2161653220004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4063402 (or 4063400 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 32.

Adding to 2161653220004 its reverse (4000223561612), we get a palindrome (6161876781616).

The spelling of 2161653220004 in words is "two trillion, one hundred sixty-one billion, six hundred fifty-three million, two hundred twenty thousand, four".