21893534 has 16 divisors (see below), whose sum is σ = 35557872. Its totient is φ = 10050048.

The previous prime is 21893527. The next prime is 21893537. The reversal of 21893534 is 43539812.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 21893494 and 21893503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21893537) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2837 + ... + 7199.

It is an arithmetic number, because the mean of its divisors is an integer number (2222367).

Almost surely, 2^21893534 is an apocalyptic number.

21893534 is a deficient number, since it is larger than the sum of its proper divisors (13664338).

21893534 is a wasteful number, since it uses less digits than its factorization.

21893534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4571.

The product of its digits is 25920, while the sum is 35.

The square root of 21893534 is about 4679.0526819005. The cubic root of 21893534 is about 279.7511990553.

The spelling of 21893534 in words is "twenty-one million, eight hundred ninety-three thousand, five hundred thirty-four".