21896545 has 8 divisors (see below), whose sum is σ = 28664640. Its totient is φ = 15924720.

The previous prime is 21896543. The next prime is 21896597. The reversal of 21896545 is 54569812.

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

It is not a de Polignac number, because 21896545 - 2¹ = 21896543 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a junction number, because it is equal to n+sod(n) for n = 21896498 and 21896507.

It is not an unprimeable number, because it can be changed into a prime (21896543) 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, 199005 + ... + 199114.

It is an arithmetic number, because the mean of its divisors is an integer number (3583080).

Almost surely, 2^21896545 is an apocalyptic number.

It is an amenable number.

21896545 is a deficient number, since it is larger than the sum of its proper divisors (6768095).

21896545 is a wasteful number, since it uses less digits than its factorization.

21896545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398135.

The product of its digits is 86400, while the sum is 40.

The square root of 21896545 is about 4679.3744240016. The cubic root of 21896545 is about 279.7640231193.

The spelling of 21896545 in words is "twenty-one million, eight hundred ninety-six thousand, five hundred forty-five".