21432045 has 32 divisors (see below), whose sum is σ = 35533440. Its totient is φ = 11024640.

The previous prime is 21432023. The next prime is 21432077. The reversal of 21432045 is 54023412.

It is not a de Polignac number, because 21432045 - 2⁵ = 21432013 is a prime.

It is a super-3 number, since 3×21432045³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 53787 + ... + 54183.

It is an arithmetic number, because the mean of its divisors is an integer number (1110420).

Almost surely, 2^21432045 is an apocalyptic number.

It is an amenable number.

21432045 is a deficient number, since it is larger than the sum of its proper divisors (14101395).

21432045 is a wasteful number, since it uses less digits than its factorization.

21432045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 525.

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 21432045 is about 4629.4756722549. The cubic root of 21432045 is about 277.7716194487.

Adding to 21432045 its reverse (54023412), we get a palindrome (75455457).

The spelling of 21432045 in words is "twenty-one million, four hundred thirty-two thousand, forty-five".