21061416 has 64 divisors (see below), whose sum is σ = 54331200. Its totient is φ = 6801408.

The previous prime is 21061363. The next prime is 21061427. The reversal of 21061416 is 61416012.

It is a junction number, because it is equal to n+sod(n) for n = 21061392 and 21061401.

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 15 ways as a sum of consecutive naturals, for example, 193170 + ... + 193278.

It is an arithmetic number, because the mean of its divisors is an integer number (848925).

Almost surely, 2^21061416 is an apocalyptic number.

It is an amenable number.

21061416 is an abundant number, since it is smaller than the sum of its proper divisors (33269784).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21061416 is a wasteful number, since it uses less digits than its factorization.

21061416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 298 (or 294 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 21061416 is about 4589.2718376666. The cubic root of 21061416 is about 276.1611115639.

Adding to 21061416 its reverse (61416012), we get a palindrome (82477428).

The spelling of 21061416 in words is "twenty-one million, sixty-one thousand, four hundred sixteen".