21334545 has 12 divisors (see below), whose sum is σ = 36979956. Its totient is φ = 11378400.

The previous prime is 21334499. The next prime is 21334559. The reversal of 21334545 is 54543312.

It can be written as a sum of positive squares in 2 ways, for example, as 10265616 + 11068929 = 3204^2 + 3327^2 .

It is not a de Polignac number, because 21334545 - 2¹⁶ = 21269009 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 237006 + ... + 237095.

It is an arithmetic number, because the mean of its divisors is an integer number (3081663).

Almost surely, 2^21334545 is an apocalyptic number.

It is an amenable number.

21334545 is a deficient number, since it is larger than the sum of its proper divisors (15645411).

21334545 is a wasteful number, since it uses less digits than its factorization.

21334545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 474112 (or 474109 counting only the distinct ones).

The product of its digits is 7200, while the sum is 27.

The square root of 21334545 is about 4618.9333184189. The cubic root of 21334545 is about 277.3497604080.

Adding to 21334545 its reverse (54543312), we get a palindrome (75877857).

The spelling of 21334545 in words is "twenty-one million, three hundred thirty-four thousand, five hundred forty-five".