2161100453325 has 72 divisors (see below), whose sum is σ = 4098123994944. Its totient is φ = 1002249388800.

The previous prime is 2161100453321. The next prime is 2161100453341. The reversal of 2161100453325 is 5233540011612.

It is not a de Polignac number, because 2161100453325 - 2² = 2161100453321 is a prime.

It is a super-3 number, since 3×2161100453325³ (a number of 38 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161100453321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 4968184 + ... + 5385633.

Almost surely, 2^{2161100453325} is an apocalyptic number.

2161100453325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2161100453325 is a deficient number, since it is larger than the sum of its proper divisors (1937023541619).

2161100453325 is a wasteful number, since it uses less digits than its factorization.

2161100453325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10353875 (or 10353859 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 33.

Adding to 2161100453325 its reverse (5233540011612), we get a palindrome (7394640464937).

The spelling of 2161100453325 in words is "two trillion, one hundred sixty-one billion, one hundred million, four hundred fifty-three thousand, three hundred twenty-five".