21410816 has 88 divisors (see below), whose sum is σ = 51093120. Its totient is φ = 8773632.

The previous prime is 21410791. The next prime is 21410833. The reversal of 21410816 is 61801412.

It is a junction number, because it is equal to n+sod(n) for n = 21410791 and 21410800.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 207821 + ... + 207923.

Almost surely, 2^21410816 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21410816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25546560).

21410816 is an abundant number, since it is smaller than the sum of its proper divisors (29682304).

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

21410816 is a wasteful number, since it uses less digits than its factorization.

21410816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159 (or 141 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 23.

The square root of 21410816 is about 4627.1822959551. The cubic root of 21410816 is about 277.6798758040.

The spelling of 21410816 in words is "twenty-one million, four hundred ten thousand, eight hundred sixteen".