21315034 has 16 divisors (see below), whose sum is σ = 35364168. Its totient is φ = 9571392.

The previous prime is 21315031. The next prime is 21315037. The reversal of 21315034 is 43051312.

It is an interprime number because it is at equal distance from previous prime (21315031) and next prime (21315037).

It can be written as a sum of positive squares in 4 ways, for example, as 20748025 + 567009 = 4555^2 + 753^2 .

It is not an unprimeable number, because it can be changed into a prime (21315031) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10117 + ... + 12040.

Almost surely, 2^21315034 is an apocalyptic number.

21315034 is a deficient number, since it is larger than the sum of its proper divisors (14049134).

21315034 is a wasteful number, since it uses less digits than its factorization.

21315034 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22209.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 21315034 is about 4616.8207675846. The cubic root of 21315034 is about 277.2651867486.

Adding to 21315034 its reverse (43051312), we get a palindrome (64366346).

The spelling of 21315034 in words is "twenty-one million, three hundred fifteen thousand, thirty-four".