21834147 has 16 divisors (see below), whose sum is σ = 29587712. Its totient is φ = 14320800.

The previous prime is 21834121. The next prime is 21834167. The reversal of 21834147 is 74143812.

It is not a de Polignac number, because 21834147 - 2⁶ = 21834083 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 (21834167) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70968 + ... + 71274.

It is an arithmetic number, because the mean of its divisors is an integer number (1849232).

Almost surely, 2^21834147 is an apocalyptic number.

21834147 is a deficient number, since it is larger than the sum of its proper divisors (7753565).

21834147 is a wasteful number, since it uses less digits than its factorization.

21834147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 618.

The product of its digits is 5376, while the sum is 30.

The square root of 21834147 is about 4672.7023230675. The cubic root of 21834147 is about 279.4980249326.

Adding to 21834147 its reverse (74143812), we get a palindrome (95977959).

The spelling of 21834147 in words is "twenty-one million, eight hundred thirty-four thousand, one hundred forty-seven".