21034115 has 4 divisors (see below), whose sum is σ = 25240944. Its totient is φ = 16827288.

The previous prime is 21034067. The next prime is 21034129. The reversal of 21034115 is 51143012.

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 21034115 - 2¹⁶ = 20968579 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21034093 and 21034102.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2103407 + ... + 2103416.

It is an arithmetic number, because the mean of its divisors is an integer number (6310236).

Almost surely, 2^21034115 is an apocalyptic number.

21034115 is a deficient number, since it is larger than the sum of its proper divisors (4206829).

21034115 is an equidigital number, since it uses as much as digits as its factorization.

21034115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4206828.

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

The square root of 21034115 is about 4586.2964361236. The cubic root of 21034115 is about 276.0417347447.

Adding to 21034115 its reverse (51143012), we get a palindrome (72177127).

The spelling of 21034115 in words is "twenty-one million, thirty-four thousand, one hundred fifteen".