21345354 has 24 divisors (see below), whose sum is σ = 46353060. Its totient is φ = 7099008.

The previous prime is 21345349. The next prime is 21345367. The reversal of 21345354 is 45354312.

It can be written as a sum of positive squares in 2 ways, for example, as 18533025 + 2812329 = 4305^2 + 1677^2 .

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8962 + ... + 11090.

Almost surely, 2^21345354 is an apocalyptic number.

21345354 is an abundant number, since it is smaller than the sum of its proper divisors (25007706).

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

21345354 is a wasteful number, since it uses less digits than its factorization.

21345354 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2694 (or 2691 counting only the distinct ones).

The product of its digits is 7200, while the sum is 27.

The square root of 21345354 is about 4620.1032455996. The cubic root of 21345354 is about 277.3965916140.

Adding to 21345354 its reverse (45354312), we get a palindrome (66699666).

The spelling of 21345354 in words is "twenty-one million, three hundred forty-five thousand, three hundred fifty-four".