21032545 has 8 divisors (see below), whose sum is σ = 25341120. Its totient is φ = 16758000.

The previous prime is 21032537. The next prime is 21032567. The reversal of 21032545 is 54523012.

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

It is not a de Polignac number, because 21032545 - 2³ = 21032537 is a prime.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7125 + ... + 9634.

It is an arithmetic number, because the mean of its divisors is an integer number (3167640).

Almost surely, 2^21032545 is an apocalyptic number.

It is an amenable number.

21032545 is a deficient number, since it is larger than the sum of its proper divisors (4308575).

21032545 is a wasteful number, since it uses less digits than its factorization.

21032545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17015.

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 21032545 is about 4586.1252708577. The cubic root of 21032545 is about 276.0348665957.

Adding to 21032545 its reverse (54523012), we get a palindrome (75555557).

The spelling of 21032545 in words is "twenty-one million, thirty-two thousand, five hundred forty-five".