21860793 has 32 divisors (see below), whose sum is σ = 34715520. Its totient is φ = 13547520.

The previous prime is 21860791. The next prime is 21860819. The reversal of 21860793 is 39706812.

It is not a de Polignac number, because 21860793 - 2¹ = 21860791 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21860791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 44278 + ... + 44768.

It is an arithmetic number, because the mean of its divisors is an integer number (1084860).

Almost surely, 2^21860793 is an apocalyptic number.

It is an amenable number.

21860793 is a deficient number, since it is larger than the sum of its proper divisors (12854727).

21860793 is a wasteful number, since it uses less digits than its factorization.

21860793 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 614 (or 608 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 21860793 is about 4675.5526946020. The cubic root of 21860793 is about 279.6116768319.

The spelling of 21860793 in words is "twenty-one million, eight hundred sixty thousand, seven hundred ninety-three".