21860380244 has 12 divisors (see below), whose sum is σ = 38826645984. Its totient is φ = 10767052824.

The previous prime is 21860380237. The next prime is 21860380249. The reversal of 21860380244 is 44208306812.

It is a junction number, because it is equal to n+sod(n) for n = 21860380198 and 21860380207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21860380249) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40784024 + ... + 40784559.

It is an arithmetic number, because the mean of its divisors is an integer number (3235553832).

Almost surely, 2^21860380244 is an apocalyptic number.

It is an amenable number.

21860380244 is a deficient number, since it is larger than the sum of its proper divisors (16966265740).

21860380244 is a wasteful number, since it uses less digits than its factorization.

21860380244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81568654 (or 81568652 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 38.

The spelling of 21860380244 in words is "twenty-one billion, eight hundred sixty million, three hundred eighty thousand, two hundred forty-four".