21352245 has 8 divisors (see below), whose sum is σ = 34163616. Its totient is φ = 11387856.

The previous prime is 21352237. The next prime is 21352249. The reversal of 21352245 is 54225312.

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

It is not a de Polignac number, because 21352245 - 2³ = 21352237 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21352249) 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, 711727 + ... + 711756.

It is an arithmetic number, because the mean of its divisors is an integer number (4270452).

Almost surely, 2^21352245 is an apocalyptic number.

It is an amenable number.

21352245 is a deficient number, since it is larger than the sum of its proper divisors (12811371).

21352245 is a wasteful number, since it uses less digits than its factorization.

21352245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1423491.

The product of its digits is 2400, while the sum is 24.

The square root of 21352245 is about 4620.8489479748. The cubic root of 21352245 is about 277.4264393934.

Subtracting from 21352245 its product of digits (2400), we obtain a triangular number (21349845 = T₆₅₃₄).

Adding to 21352245 its reverse (54225312), we get a palindrome (75577557).

The spelling of 21352245 in words is "twenty-one million, three hundred fifty-two thousand, two hundred forty-five".