2161421636236 has 24 divisors (see below), whose sum is σ = 3865651292160. Its totient is φ = 1056981802512.

The previous prime is 2161421636233. The next prime is 2161421636237. The reversal of 2161421636236 is 6326361241612.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 2161421636192 and 2161421636201.

It is not an unprimeable number, because it can be changed into a prime (2161421636233) 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 7 ways as a sum of consecutive naturals, for example, 3724230 + ... + 4265293.

It is an arithmetic number, because the mean of its divisors is an integer number (161068803840).

Almost surely, 2^{2161421636236} is an apocalyptic number.

It is an amenable number.

2161421636236 is a deficient number, since it is larger than the sum of its proper divisors (1704229655924).

2161421636236 is a wasteful number, since it uses less digits than its factorization.

2161421636236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7991013 (or 7991011 counting only the distinct ones).

The product of its digits is 373248, while the sum is 43.

Adding to 2161421636236 its reverse (6326361241612), we get a palindrome (8487782877848).

The spelling of 2161421636236 in words is "two trillion, one hundred sixty-one billion, four hundred twenty-one million, six hundred thirty-six thousand, two hundred thirty-six".