21534610 has 16 divisors (see below), whose sum is σ = 39254400. Its totient is φ = 8504496.

The previous prime is 21534577. The next prime is 21534659. The reversal of 21534610 is 1643512.

It is a super-3 number, since 3×21534610³ (a number of 23 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12840 + ... + 14419.

It is an arithmetic number, because the mean of its divisors is an integer number (2453400).

Almost surely, 2^21534610 is an apocalyptic number.

21534610 is a deficient number, since it is larger than the sum of its proper divisors (17719790).

21534610 is a wasteful number, since it uses less digits than its factorization.

21534610 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27345.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 21534610 is about 4640.5398392859. The cubic root of 21534610 is about 278.2140149363.

The spelling of 21534610 in words is "twenty-one million, five hundred thirty-four thousand, six hundred ten".