21710416 has 120 divisors (see below), whose sum is σ = 55186944. Its totient is φ = 8087040.

The previous prime is 21710389. The next prime is 21710417. The reversal of 21710416 is 61401712.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21710417) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 586750 + ... + 586786.

Almost surely, 2^21710416 is an apocalyptic number.

21710416 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21710416, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27593472).

21710416 is an abundant number, since it is smaller than the sum of its proper divisors (33476528).

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

21710416 is a wasteful number, since it uses less digits than its factorization.

21710416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109 (or 90 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 22.

The square root of 21710416 is about 4659.4437436243. The cubic root of 21710416 is about 278.9690659982.

The spelling of 21710416 in words is "twenty-one million, seven hundred ten thousand, four hundred sixteen".