21262165544 has 32 divisors (see below), whose sum is σ = 40385779200. Its totient is φ = 10492722240.

The previous prime is 21262165531. The next prime is 21262165549. The reversal of 21262165544 is 44556126212.

It is a junction number, because it is equal to n+sod(n) for n = 21262165498 and 21262165507.

It is not an unprimeable number, because it can be changed into a prime (21262165549) 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, 2695334 + ... + 2703210.

It is an arithmetic number, because the mean of its divisors is an integer number (1262055600).

Almost surely, 2^21262165544 is an apocalyptic number.

It is an amenable number.

21262165544 is a deficient number, since it is larger than the sum of its proper divisors (19123613656).

21262165544 is a wasteful number, since it uses less digits than its factorization.

21262165544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12233 (or 12229 counting only the distinct ones).

The product of its digits is 115200, while the sum is 38.

The spelling of 21262165544 in words is "twenty-one billion, two hundred sixty-two million, one hundred sixty-five thousand, five hundred forty-four".