21862964636 has 24 divisors (see below), whose sum is σ = 38791406640. Its totient is φ = 10780503552.

The previous prime is 21862964623. The next prime is 21862964639. The reversal of 21862964636 is 63646926812.

It is a super-2 number, since 2×21862964636² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21862964639) 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 7 ways as a sum of consecutive naturals, for example, 10250 + ... + 209358.

It is an arithmetic number, because the mean of its divisors is an integer number (1616308610).

Almost surely, 2^21862964636 is an apocalyptic number.

It is an amenable number.

21862964636 is a deficient number, since it is larger than the sum of its proper divisors (16928442004).

21862964636 is a wasteful number, since it uses less digits than its factorization.

21862964636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199493 (or 199491 counting only the distinct ones).

The product of its digits is 4478976, while the sum is 53.

The spelling of 21862964636 in words is "twenty-one billion, eight hundred sixty-two million, nine hundred sixty-four thousand, six hundred thirty-six".