21135354 has 8 divisors (see below), whose sum is σ = 42270720. Its totient is φ = 7045116.

The previous prime is 21135349. The next prime is 21135371. The reversal of 21135354 is 45353112.

It is a sphenic number, since it is the product of 3 distinct primes.

21135354 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1761274 + ... + 1761285.

It is an arithmetic number, because the mean of its divisors is an integer number (5283840).

Almost surely, 2^21135354 is an apocalyptic number.

21135354 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21135354 is a wasteful number, since it uses less digits than its factorization.

21135354 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3522564.

The product of its digits is 1800, while the sum is 24.

The square root of 21135354 is about 4597.3203064394. The cubic root of 21135354 is about 276.4838969636.

Adding to 21135354 its reverse (45353112), we get a palindrome (66488466).

The spelling of 21135354 in words is "twenty-one million, one hundred thirty-five thousand, three hundred fifty-four".