2156204636 has 12 divisors (see below), whose sum is σ = 3903474120. Its totient is φ = 1040926320.

The previous prime is 2156204629. The next prime is 2156204647. The reversal of 2156204636 is 6364026512.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 2156204596 and 2156204605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9293870 + ... + 9294101.

It is an arithmetic number, because the mean of its divisors is an integer number (325289510).

Almost surely, 2^2156204636 is an apocalyptic number.

It is an amenable number.

2156204636 is a deficient number, since it is larger than the sum of its proper divisors (1747269484).

2156204636 is a wasteful number, since it uses less digits than its factorization.

2156204636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18588004 (or 18588002 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 35.

The square root of 2156204636 is about 46434.9505868155. The cubic root of 2156204636 is about 1291.9032531147.

The spelling of 2156204636 in words is "two billion, one hundred fifty-six million, two hundred four thousand, six hundred thirty-six".