21860534 has 8 divisors (see below), whose sum is σ = 34216560. Its totient is φ = 10455016.

The previous prime is 21860533. The next prime is 21860543. The reversal of 21860534 is 43506812.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 21860497 and 21860506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21860533) 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, 237569 + ... + 237660.

It is an arithmetic number, because the mean of its divisors is an integer number (4277070).

Almost surely, 2^21860534 is an apocalyptic number.

21860534 is a deficient number, since it is larger than the sum of its proper divisors (12356026).

21860534 is a wasteful number, since it uses less digits than its factorization.

21860534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 475254.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 21860534 is about 4675.5249972597. The cubic root of 21860534 is about 279.6105725763.

The spelling of 21860534 in words is "twenty-one million, eight hundred sixty thousand, five hundred thirty-four".