21936045 has 8 divisors (see below), whose sum is σ = 35097696. Its totient is φ = 11699216.

The previous prime is 21936037. The next prime is 21936059. The reversal of 21936045 is 54063912.

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

It is a cyclic number.

It is not a de Polignac number, because 21936045 - 2³ = 21936037 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 731187 + ... + 731216.

It is an arithmetic number, because the mean of its divisors is an integer number (4387212).

Almost surely, 2^21936045 is an apocalyptic number.

It is an amenable number.

21936045 is a deficient number, since it is larger than the sum of its proper divisors (13161651).

21936045 is a wasteful number, since it uses less digits than its factorization.

21936045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1462411.

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 21936045 is about 4683.5931719141. The cubic root of 21936045 is about 279.9321476743.

Adding to 21936045 its reverse (54063912), we get a palindrome (75999957).

The spelling of 21936045 in words is "twenty-one million, nine hundred thirty-six thousand, forty-five".