21162845 has 8 divisors (see below), whose sum is σ = 27704160. Its totient is φ = 15391120.

The previous prime is 21162839. The next prime is 21162851. The reversal of 21162845 is 54826112.

It is an interprime number because it is at equal distance from previous prime (21162839) and next prime (21162851).

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

It is not a de Polignac number, because 21162845 - 2²⁴ = 4385629 is a prime.

It is a Curzon number.

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, 192335 + ... + 192444.

It is an arithmetic number, because the mean of its divisors is an integer number (3463020).

Almost surely, 2^21162845 is an apocalyptic number.

It is an amenable number.

21162845 is a deficient number, since it is larger than the sum of its proper divisors (6541315).

21162845 is a wasteful number, since it uses less digits than its factorization.

21162845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 384795.

The product of its digits is 3840, while the sum is 29.

The square root of 21162845 is about 4600.3092287367. The cubic root of 21162845 is about 276.6037202969.

Adding to 21162845 its reverse (54826112), we get a palindrome (75988957).

The spelling of 21162845 in words is "twenty-one million, one hundred sixty-two thousand, eight hundred forty-five".