21060616 has 32 divisors (see below), whose sum is σ = 40622400. Its totient is φ = 10232640.

The previous prime is 21060553. The next prime is 21060619. The reversal of 21060616 is 61606012.

It is not an unprimeable number, because it can be changed into a prime (21060619) 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, 50055 + ... + 50473.

It is an arithmetic number, because the mean of its divisors is an integer number (1269450).

Almost surely, 2^21060616 is an apocalyptic number.

It is an amenable number.

21060616 is a deficient number, since it is larger than the sum of its proper divisors (19561784).

21060616 is a wasteful number, since it uses less digits than its factorization.

21060616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 589 (or 585 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 21060616 is about 4589.1846770423. The cubic root of 21060616 is about 276.1576149379.

Adding to 21060616 its reverse (61606012), we get a palindrome (82666628).

The spelling of 21060616 in words is "twenty-one million, sixty thousand, six hundred sixteen".