21413322 has 80 divisors (see below), whose sum is σ = 57290112. Its totient is φ = 5844960.

The previous prime is 21413303. The next prime is 21413369. The reversal of 21413322 is 22331412.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21413295 and 21413304.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 25672 + ... + 26492.

Almost surely, 2^21413322 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21413322, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28645056).

21413322 is an abundant number, since it is smaller than the sum of its proper divisors (35876790).

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

21413322 is a wasteful number, since it uses less digits than its factorization.

21413322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 865 (or 856 counting only the distinct ones).

The product of its digits is 288, while the sum is 18.

The square root of 21413322 is about 4627.4530791787. The cubic root of 21413322 is about 277.6907089365.

Adding to 21413322 its reverse (22331412), we get a palindrome (43744734).

It can be divided in two parts, 21413 and 322, that multiplied together give a palindrome (6894986).

The spelling of 21413322 in words is "twenty-one million, four hundred thirteen thousand, three hundred twenty-two".