21936075 has 72 divisors (see below), whose sum is σ = 43425792. Its totient is φ = 9737280.

The previous prime is 21936067. The next prime is 21936077. The reversal of 21936075 is 57063912.

It is not a de Polignac number, because 21936075 - 2³ = 21936067 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21936077) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 172662 + ... + 172788.

It is an arithmetic number, because the mean of its divisors is an integer number (603136).

Almost surely, 2^21936075 is an apocalyptic number.

21936075 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21936075 is a deficient number, since it is larger than the sum of its proper divisors (21489717).

21936075 is a wasteful number, since it uses less digits than its factorization.

21936075 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201 (or 189 counting only the distinct ones).

The product of its (nonzero) digits is 11340, while the sum is 33.

The square root of 21936075 is about 4683.5963745823. The cubic root of 21936075 is about 279.9322752871.

Adding to 21936075 its reverse (57063912), we get a palindrome (78999987).

The spelling of 21936075 in words is "twenty-one million, nine hundred thirty-six thousand, seventy-five".