21960845 has 4 divisors (see below), whose sum is σ = 26353020. Its totient is φ = 17568672.

The previous prime is 21960833. The next prime is 21960847. The reversal of 21960845 is 54806912.

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

It can be written as a sum of positive squares in 2 ways, for example, as 15665764 + 6295081 = 3958^2 + 2509^2 .

It is a cyclic number.

It is not a de Polignac number, because 21960845 - 2⁶ = 21960781 is a prime.

It is a super-2 number, since 2×21960845² = 964557426228050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21960847) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2196080 + ... + 2196089.

It is an arithmetic number, because the mean of its divisors is an integer number (6588255).

Almost surely, 2^21960845 is an apocalyptic number.

It is an amenable number.

21960845 is a deficient number, since it is larger than the sum of its proper divisors (4392175).

21960845 is an equidigital number, since it uses as much as digits as its factorization.

21960845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4392174.

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 21960845 is about 4686.2399639797. The cubic root of 21960845 is about 280.0376012428.

The spelling of 21960845 in words is "twenty-one million, nine hundred sixty thousand, eight hundred forty-five".