21533354 has 8 divisors (see below), whose sum is σ = 32689440. Its totient is φ = 10636876.

The previous prime is 21533333. The next prime is 21533357. The reversal of 21533354 is 45333512.

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

It is not an unprimeable number, because it can be changed into a prime (21533357) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64694 + ... + 65025.

It is an arithmetic number, because the mean of its divisors is an integer number (4086180).

Almost surely, 2^21533354 is an apocalyptic number.

21533354 is a deficient number, since it is larger than the sum of its proper divisors (11156086).

21533354 is a wasteful number, since it uses less digits than its factorization.

21533354 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129804.

The product of its digits is 5400, while the sum is 26.

The square root of 21533354 is about 4640.4045082299. The cubic root of 21533354 is about 278.2086059134.

Adding to 21533354 its reverse (45333512), we get a palindrome (66866866).

The spelling of 21533354 in words is "twenty-one million, five hundred thirty-three thousand, three hundred fifty-four".