21035147 has 16 divisors (see below), whose sum is σ = 25555200. Its totient is φ = 16912800.

The previous prime is 21035123. The next prime is 21035149. The reversal of 21035147 is 74153012.

It is a cyclic number.

It is not a de Polignac number, because 21035147 - 2⁸ = 21034891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21035149) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 13772 + ... + 15222.

It is an arithmetic number, because the mean of its divisors is an integer number (1597200).

Almost surely, 2^21035147 is an apocalyptic number.

21035147 is a deficient number, since it is larger than the sum of its proper divisors (4520053).

21035147 is a wasteful number, since it uses less digits than its factorization.

21035147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1586.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 21035147 is about 4586.4089438252. The cubic root of 21035147 is about 276.0462491634.

Adding to 21035147 its reverse (74153012), we get a palindrome (95188159).

The spelling of 21035147 in words is "twenty-one million, thirty-five thousand, one hundred forty-seven".