21834131 has 4 divisors (see below), whose sum is σ = 23819064. Its totient is φ = 19849200.

The previous prime is 21834121. The next prime is 21834167. The reversal of 21834131 is 13143812.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21834131 - 2¹⁰ = 21833107 is a prime.

It is a super-2 number, since 2×21834131² = 953458553050322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21834097 and 21834106.

It is not an unprimeable number, because it can be changed into a prime (21834121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 992450 + ... + 992471.

It is an arithmetic number, because the mean of its divisors is an integer number (5954766).

Almost surely, 2^21834131 is an apocalyptic number.

21834131 is a deficient number, since it is larger than the sum of its proper divisors (1984933).

21834131 is a wasteful number, since it uses less digits than its factorization.

21834131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1984932.

The product of its digits is 576, while the sum is 23.

The square root of 21834131 is about 4672.7006109957. The cubic root of 21834131 is about 279.4979566608.

Adding to 21834131 its reverse (13143812), we get a palindrome (34977943).

The spelling of 21834131 in words is "twenty-one million, eight hundred thirty-four thousand, one hundred thirty-one".