21154334 has 8 divisors (see below), whose sum is σ = 33401640. Its totient is φ = 10020456.

The previous prime is 21154283. The next prime is 21154339. The reversal of 21154334 is 43345112.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21154339) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 278309 + ... + 278384.

It is an arithmetic number, because the mean of its divisors is an integer number (4175205).

Almost surely, 2^21154334 is an apocalyptic number.

21154334 is a deficient number, since it is larger than the sum of its proper divisors (12247306).

21154334 is a wasteful number, since it uses less digits than its factorization.

21154334 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 556714.

The product of its digits is 1440, while the sum is 23.

The square root of 21154334 is about 4599.3840892015. The cubic root of 21154334 is about 276.5666350196.

Adding to 21154334 its reverse (43345112), we get a palindrome (64499446).

It can be divided in two parts, 211 and 54334, that added together give a palindrome (54545).

The spelling of 21154334 in words is "twenty-one million, one hundred fifty-four thousand, three hundred thirty-four".