2112161636 has 24 divisors (see below), whose sum is σ = 3990578424. Its totient is φ = 972403200.

The previous prime is 2112161629. The next prime is 2112161641. The reversal of 2112161636 is 6361612112.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1279492900 + 832668736 = 35770^2 + 28856^2 .

It is a super-2 number, since 2×2112161636² = 8922453553180392992, which contains 22 as substring.

It is a Smith number, since the sum of its digits (29) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 2112161599 and 2112161608.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 29795 + ... + 71498.

It is an arithmetic number, because the mean of its divisors is an integer number (166274101).

Almost surely, 2^2112161636 is an apocalyptic number.

2112161636 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

2112161636 is a deficient number, since it is larger than the sum of its proper divisors (1878416788).

2112161636 is a wasteful number, since it uses less digits than its factorization.

2112161636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101711 (or 101709 counting only the distinct ones).

The product of its digits is 2592, while the sum is 29.

The square root of 2112161636 is about 45958.2597146585. The cubic root of 2112161636 is about 1283.0464617833.

Adding to 2112161636 its reverse (6361612112), we get a palindrome (8473773748).

The spelling of 2112161636 in words is "two billion, one hundred twelve million, one hundred sixty-one thousand, six hundred thirty-six".