21034147 has 8 divisors (see below), whose sum is σ = 21402576. Its totient is φ = 20668032.

The previous prime is 21034133. The next prime is 21034183. The reversal of 21034147 is 74143012.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21034147 is a prime.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21034187) 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 7 ways as a sum of consecutive naturals, for example, 33783 + ... + 34399.

It is an arithmetic number, because the mean of its divisors is an integer number (2675322).

Almost surely, 2^21034147 is an apocalyptic number.

21034147 is a deficient number, since it is larger than the sum of its proper divisors (368429).

21034147 is an equidigital number, since it uses as much as digits as its factorization.

21034147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1157.

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 21034147 is about 4586.2999247760. The cubic root of 21034147 is about 276.0418747288.

Adding to 21034147 its reverse (74143012), we get a palindrome (95177159).

The spelling of 21034147 in words is "twenty-one million, thirty-four thousand, one hundred forty-seven".