21134715 has 64 divisors (see below), whose sum is σ = 41091072. Its totient is φ = 9072000.

The previous prime is 21134713. The next prime is 21134717. The reversal of 21134715 is 51743112.

It is an interprime number because it is at equal distance from previous prime (21134713) and next prime (21134717).

It is not a de Polignac number, because 21134715 - 2¹ = 21134713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21134713) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 139890 + ... + 140040.

It is an arithmetic number, because the mean of its divisors is an integer number (642048).

Almost surely, 2^21134715 is an apocalyptic number.

21134715 is a deficient number, since it is larger than the sum of its proper divisors (19956357).

21134715 is a wasteful number, since it uses less digits than its factorization.

21134715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240.

The product of its digits is 840, while the sum is 24.

The square root of 21134715 is about 4597.2508089074. The cubic root of 21134715 is about 276.4811105583.

Adding to 21134715 its reverse (51743112), we get a palindrome (72877827).

The spelling of 21134715 in words is "twenty-one million, one hundred thirty-four thousand, seven hundred fifteen".