21572035 has 8 divisors (see below), whose sum is σ = 25914096. Its totient is φ = 17239200.

The previous prime is 21572003. The next prime is 21572041. The reversal of 21572035 is 53027512.

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

It is not a de Polignac number, because 21572035 - 2⁵ = 21572003 is a prime.

It is a Duffinian number.

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, 4885 + ... + 8185.

It is an arithmetic number, because the mean of its divisors is an integer number (3239262).

Almost surely, 2^21572035 is an apocalyptic number.

21572035 is a deficient number, since it is larger than the sum of its proper divisors (4342061).

21572035 is a wasteful number, since it uses less digits than its factorization.

21572035 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4613.

The product of its (nonzero) digits is 2100, while the sum is 25.

The square root of 21572035 is about 4644.5704860622. The cubic root of 21572035 is about 278.3750910452.

Adding to 21572035 its reverse (53027512), we get a palindrome (74599547).

The spelling of 21572035 in words is "twenty-one million, five hundred seventy-two thousand, thirty-five".