21353046 has 64 divisors (see below), whose sum is σ = 51480576. Its totient is φ = 5817600.

The previous prime is 21353029. The next prime is 21353047. The reversal of 21353046 is 64035312.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21353047) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 34875 + ... + 35481.

It is an arithmetic number, because the mean of its divisors is an integer number (804384).

Almost surely, 2^21353046 is an apocalyptic number.

21353046 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 21353046, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25740288).

21353046 is an abundant number, since it is smaller than the sum of its proper divisors (30127530).

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

21353046 is a wasteful number, since it uses less digits than its factorization.

21353046 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 677.

The product of its (nonzero) digits is 2160, while the sum is 24.

The square root of 21353046 is about 4620.9356195472. The cubic root of 21353046 is about 277.4299084400.

Adding to 21353046 its reverse (64035312), we get a palindrome (85388358).

The spelling of 21353046 in words is "twenty-one million, three hundred fifty-three thousand, forty-six".