21365534 has 4 divisors (see below), whose sum is σ = 32048304. Its totient is φ = 10682766.

The previous prime is 21365527. The next prime is 21365543. The reversal of 21365534 is 43556312.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 21365497 and 21365506.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5341382 + ... + 5341385.

It is an arithmetic number, because the mean of its divisors is an integer number (8012076).

Almost surely, 2^21365534 is an apocalyptic number.

21365534 is a deficient number, since it is larger than the sum of its proper divisors (10682770).

21365534 is a wasteful number, since it uses less digits than its factorization.

21365534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10682769.

The product of its digits is 10800, while the sum is 29.

The square root of 21365534 is about 4622.2866635465. The cubic root of 21365534 is about 277.4839814361.

The spelling of 21365534 in words is "twenty-one million, three hundred sixty-five thousand, five hundred thirty-four".