21362545 has 8 divisors (see below), whose sum is σ = 25681320. Its totient is φ = 17059200.

The previous prime is 21362533. The next prime is 21362567. The reversal of 21362545 is 54526312.

It can be written as a sum of positive squares in 4 ways, for example, as 1993744 + 19368801 = 1412^2 + 4401^2 .

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

It is not a de Polignac number, because 21362545 - 2⁵ = 21362513 is a prime.

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, 550 + ... + 6559.

It is an arithmetic number, because the mean of its divisors is an integer number (3210165).

Almost surely, 2^21362545 is an apocalyptic number.

It is an amenable number.

21362545 is a deficient number, since it is larger than the sum of its proper divisors (4318775).

21362545 is an equidigital number, since it uses as much as digits as its factorization.

21362545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7715.

The product of its digits is 7200, while the sum is 28.

The square root of 21362545 is about 4621.9633274183. The cubic root of 21362545 is about 277.4710409950.

Adding to 21362545 its reverse (54526312), we get a palindrome (75888857).

The spelling of 21362545 in words is "twenty-one million, three hundred sixty-two thousand, five hundred forty-five".