21245023 has 8 divisors (see below), whose sum is σ = 22056480. Its totient is φ = 20438880.

The previous prime is 21244999. The next prime is 21245027. The reversal of 21245023 is 32054212.

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 21245023 - 2⁵ = 21244991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21245027) 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, 8038 + ... + 10348.

It is an arithmetic number, because the mean of its divisors is an integer number (2757060).

Almost surely, 2^21245023 is an apocalyptic number.

21245023 is a deficient number, since it is larger than the sum of its proper divisors (811457).

21245023 is a wasteful number, since it uses less digits than its factorization.

21245023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2657.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 21245023 is about 4609.2323655897. The cubic root of 21245023 is about 276.9612869304.

Adding to 21245023 its reverse (32054212), we get a palindrome (53299235).

The spelling of 21245023 in words is "twenty-one million, two hundred forty-five thousand, twenty-three".