2161252241244 has 72 divisors (see below), whose sum is σ = 5476737560112. Its totient is φ = 718628267520.

The previous prime is 2161252241219. The next prime is 2161252241249. The reversal of 2161252241244 is 4421422521612.

2161252241244 is a `hidden beast` number, since 2 + 1 + 6 + 1 + 2 + 522 + 4 + 124 + 4 = 666.

It is a super-2 number, since 2×2161252241244² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 2161252241199 and 2161252241208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161252241249) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 145600087 + ... + 145614929.

It is an arithmetic number, because the mean of its divisors is an integer number (76065799446).

Almost surely, 2^{2161252241244} is an apocalyptic number.

It is an amenable number.

2161252241244 is an abundant number, since it is smaller than the sum of its proper divisors (3315485318868).

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

2161252241244 is a wasteful number, since it uses less digits than its factorization.

2161252241244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24627 (or 24622 counting only the distinct ones).

The product of its digits is 61440, while the sum is 36.

Adding to 2161252241244 its reverse (4421422521612), we get a palindrome (6582674762856).

The spelling of 2161252241244 in words is "two trillion, one hundred sixty-one billion, two hundred fifty-two million, two hundred forty-one thousand, two hundred forty-four".