21540354 has 16 divisors (see below), whose sum is σ = 46997280. Its totient is φ = 6527360.

The previous prime is 21540349. The next prime is 21540361. The reversal of 21540354 is 45304512.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 163119 + ... + 163250.

It is an arithmetic number, because the mean of its divisors is an integer number (2937330).

Almost surely, 2^21540354 is an apocalyptic number.

21540354 is an abundant number, since it is smaller than the sum of its proper divisors (25456926).

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

21540354 is a wasteful number, since it uses less digits than its factorization.

21540354 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 326385.

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 21540354 is about 4641.1586915338. The cubic root of 21540354 is about 278.2387490617.

Adding to 21540354 its reverse (45304512), we get a palindrome (66844866).

The spelling of 21540354 in words is "twenty-one million, five hundred forty thousand, three hundred fifty-four".