21845602 has 4 divisors (see below), whose sum is σ = 32768406.
Its totient is φ = 10922800.
The previous prime is 21845597. The next prime is 21845627. The reversal of 21845602 is 20654812.
It is a semiprime because it is the product of two primes.
It can be written as a sum of positive squares in only one way, i.e., 20079361 + 1766241 = 4481^2 + 1329^2
It is an unprimeable number.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5461399 + ... + 5461402.
Almost surely, 221845602 is an apocalyptic number.
21845602 is a deficient number, since it is larger than the sum of its proper divisors (10922804).
21845602 is a wasteful number, since it uses less digits than its factorization.
21845602 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 10922803.
The product of its (nonzero) digits is 3840, while the sum is 28.
The square root of 21845602 is about 4673.9278984597.
The cubic root of 21845602 is about 279.5468947165.
The spelling of 21845602 in words is "twenty-one million, eight hundred forty-five thousand, six hundred two".