21359416 has 32 divisors (see below), whose sum is σ = 43873200. Its totient is φ = 9691104.

The previous prime is 21359413. The next prime is 21359417. The reversal of 21359416 is 61495312.

It is a super-2 number, since 2×21359416² = 912449303722112, which contains 22 as substring.

It is an enlightened number because it begins with the concatenation of its prime factors (21359).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21359413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 361995 + ... + 362053.

Almost surely, 2^21359416 is an apocalyptic number.

21359416 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 21359416, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21936600).

21359416 is an abundant number, since it is smaller than the sum of its proper divisors (22513784).

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

21359416 is an frugal number, since it uses more digits than its factorization.

21359416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196 (or 74 counting only the distinct ones).

The product of its digits is 6480, while the sum is 31.

The square root of 21359416 is about 4621.6248225056. The cubic root of 21359416 is about 277.4574931510.

The spelling of 21359416 in words is "twenty-one million, three hundred fifty-nine thousand, four hundred sixteen".