2161121022 has 48 divisors (see below), whose sum is σ = 4994151552. Its totient is φ = 673036800.

The previous prime is 2161121021. The next prime is 2161121033. The reversal of 2161121022 is 2201211612.

2161121022 is a `hidden beast` number, since 21 + 611 + 2 + 10 + 22 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 2161120986 and 2161121004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161121021) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16147 + ... + 67697.

It is an arithmetic number, because the mean of its divisors is an integer number (104044824).

Almost surely, 2^2161121022 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2161121022, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2497075776).

2161121022 is an abundant number, since it is smaller than the sum of its proper divisors (2833030530).

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

2161121022 is a wasteful number, since it uses less digits than its factorization.

2161121022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51713 (or 51710 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 2161121022 is about 46487.8588665901. The cubic root of 2161121022 is about 1292.8844020736.

Adding to 2161121022 its reverse (2201211612), we get a palindrome (4362332634).

The spelling of 2161121022 in words is "two billion, one hundred sixty-one million, one hundred twenty-one thousand, twenty-two".