21134570 has 48 divisors (see below), whose sum is σ = 41378688. Its totient is φ = 7768320.

The previous prime is 21134569. The next prime is 21134573. The reversal of 21134570 is 7543112.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21134573) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 205139 + ... + 205241.

It is an arithmetic number, because the mean of its divisors is an integer number (862056).

Almost surely, 2^21134570 is an apocalyptic number.

21134570 is a deficient number, since it is larger than the sum of its proper divisors (20244118).

21134570 is a wasteful number, since it uses less digits than its factorization.

21134570 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215 (or 198 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 21134570 is about 4597.2350385857. The cubic root of 21134570 is about 276.4804782675.

Adding to 21134570 its reverse (7543112), we get a palindrome (28677682).

The spelling of 21134570 in words is "twenty-one million, one hundred thirty-four thousand, five hundred seventy".