21134331 has 16 divisors (see below), whose sum is σ = 31843200. Its totient is φ = 13849704.

The previous prime is 21134293. The next prime is 21134353. The reversal of 21134331 is 13343112.

It is not a de Polignac number, because 21134331 - 2¹⁷ = 21003259 is a prime.

It is a super-2 number, since 2×21134331² = 893319893635122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21134231) 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, 5041 + ... + 8226.

It is an arithmetic number, because the mean of its divisors is an integer number (1990200).

Almost surely, 2^21134331 is an apocalyptic number.

21134331 is a deficient number, since it is larger than the sum of its proper divisors (10708869).

21134331 is a wasteful number, since it uses less digits than its factorization.

21134331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13335 (or 13329 counting only the distinct ones).

The product of its digits is 216, while the sum is 18.

The square root of 21134331 is about 4597.2090446270. The cubic root of 21134331 is about 276.4794360717.

Adding to 21134331 its reverse (13343112), we get a palindrome (34477443).

The spelling of 21134331 in words is "twenty-one million, one hundred thirty-four thousand, three hundred thirty-one".