2161506213 has 24 divisors (see below), whose sum is σ = 3370273920. Its totient is φ = 1330818720.

The previous prime is 2161506211. The next prime is 2161506311. The reversal of 2161506213 is 3126051612.

2161506213 is a `hidden beast` number, since 21 + 6 + 15 + 0 + 621 + 3 = 666.

It is not a de Polignac number, because 2161506213 - 2¹ = 2161506211 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161506211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 174033 + ... + 186038.

It is an arithmetic number, because the mean of its divisors is an integer number (140428080).

Almost surely, 2^2161506213 is an apocalyptic number.

2161506213 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

2161506213 is a deficient number, since it is larger than the sum of its proper divisors (1208767707).

2161506213 is a wasteful number, since it uses less digits than its factorization.

2161506213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360129 (or 360126 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 2161506213 is about 46492.0016024262. The cubic root of 2161506213 is about 1292.9612106444.

Adding to 2161506213 its reverse (3126051612), we get a palindrome (5287557825).

The spelling of 2161506213 in words is "two billion, one hundred sixty-one million, five hundred six thousand, two hundred thirteen".