21412545 has 32 divisors (see below), whose sum is σ = 42716160. Its totient is φ = 8898240.

The previous prime is 21412513. The next prime is 21412549. The reversal of 21412545 is 54521412.

It is not a de Polignac number, because 21412545 - 2⁵ = 21412513 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (21412549) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8115 + ... + 10424.

It is an arithmetic number, because the mean of its divisors is an integer number (1334880).

Almost surely, 2^21412545 is an apocalyptic number.

It is an amenable number.

21412545 is a deficient number, since it is larger than the sum of its proper divisors (21303615).

21412545 is a wasteful number, since it uses less digits than its factorization.

21412545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18565.

The product of its digits is 1600, while the sum is 24.

The square root of 21412545 is about 4627.3691229466. The cubic root of 21412545 is about 277.6873501506.

Adding to 21412545 its reverse (54521412), we get a palindrome (75933957).

The spelling of 21412545 in words is "twenty-one million, four hundred twelve thousand, five hundred forty-five".