21341545 has 16 divisors (see below), whose sum is σ = 27751680. Its totient is φ = 15692544.

The previous prime is 21341543. The next prime is 21341549. The reversal of 21341545 is 54514312.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21341545 - 2¹ = 21341543 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21341543) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 736 + ... + 6574.

It is an arithmetic number, because the mean of its divisors is an integer number (1734480).

Almost surely, 2^21341545 is an apocalyptic number.

It is an amenable number.

21341545 is a deficient number, since it is larger than the sum of its proper divisors (6410135).

21341545 is a wasteful number, since it uses less digits than its factorization.

21341545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5904.

The product of its digits is 2400, while the sum is 25.

The square root of 21341545 is about 4619.6910069830. The cubic root of 21341545 is about 277.3800904983.

Adding to 21341545 its reverse (54514312), we get a palindrome (75855857).

The spelling of 21341545 in words is "twenty-one million, three hundred forty-one thousand, five hundred forty-five".