21115346 has 32 divisors (see below), whose sum is σ = 38415360. Its totient is φ = 8503056.

The previous prime is 21115331. The next prime is 21115373. The reversal of 21115346 is 64351112.

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, 43115 + ... + 43601.

It is an arithmetic number, because the mean of its divisors is an integer number (1200480).

Almost surely, 2^21115346 is an apocalyptic number.

21115346 is a deficient number, since it is larger than the sum of its proper divisors (17300014).

21115346 is a wasteful number, since it uses less digits than its factorization.

21115346 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 678.

The product of its digits is 720, while the sum is 23.

The square root of 21115346 is about 4595.1437409509. The cubic root of 21115346 is about 276.3966239780.

Adding to 21115346 its reverse (64351112), we get a palindrome (85466458).

The spelling of 21115346 in words is "twenty-one million, one hundred fifteen thousand, three hundred forty-six".