21350466 has 48 divisors (see below), whose sum is σ = 48432384. Its totient is φ = 7048944.

The previous prime is 21350437. The next prime is 21350479. The reversal of 21350466 is 66405312.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 95631 + ... + 95853.

It is an arithmetic number, because the mean of its divisors is an integer number (1009008).

It is a vampire number, since it can be written as 3546 ⋅ 6021 (with its own digits).

Almost surely, 2^21350466 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21350466, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24216192).

21350466 is an abundant number, since it is smaller than the sum of its proper divisors (27081918).

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

21350466 is a wasteful number, since it uses less digits than its factorization.

21350466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437 (or 425 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 21350466 is about 4620.6564468699. The cubic root of 21350466 is about 277.4187344215.

Adding to 21350466 its reverse (66405312), we get a palindrome (87755778).

The spelling of 21350466 in words is "twenty-one million, three hundred fifty thousand, four hundred sixty-six".