21893535 has 24 divisors (see below), whose sum is σ = 40182480. Its totient is φ = 10989312.

The previous prime is 21893527. The next prime is 21893537. The reversal of 21893535 is 53539812.

It is not a de Polignac number, because 21893535 - 2³ = 21893527 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21893535.

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

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13545 + ... + 15074.

It is an arithmetic number, because the mean of its divisors is an integer number (1674270).

Almost surely, 2^21893535 is an apocalyptic number.

21893535 is a deficient number, since it is larger than the sum of its proper divisors (18288945).

21893535 is a wasteful number, since it uses less digits than its factorization.

21893535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28647 (or 28644 counting only the distinct ones).

The product of its digits is 32400, while the sum is 36.

The square root of 21893535 is about 4679.0527887597. The cubic root of 21893535 is about 279.7512033145.

The spelling of 21893535 in words is "twenty-one million, eight hundred ninety-three thousand, five hundred thirty-five".