21134015 has 16 divisors (see below), whose sum is σ = 29533248. Its totient is φ = 14217216.

The previous prime is 21133979. The next prime is 21134021. The reversal of 21134015 is 51043112.

It is a cyclic number.

It is not a de Polignac number, because 21134015 - 2¹⁴ = 21117631 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21133984 and 21134002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3842 + ... + 7551.

It is an arithmetic number, because the mean of its divisors is an integer number (1845828).

Almost surely, 2^21134015 is an apocalyptic number.

21134015 is a deficient number, since it is larger than the sum of its proper divisors (8399233).

21134015 is a wasteful number, since it uses less digits than its factorization.

21134015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11458.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 21134015 is about 4597.1746758199. The cubic root of 21134015 is about 276.4780580936.

Adding to 21134015 its reverse (51043112), we get a palindrome (72177127).

The spelling of 21134015 in words is "twenty-one million, one hundred thirty-four thousand, fifteen".