21354154 has 4 divisors (see below), whose sum is σ = 32031234. Its totient is φ = 10677076.

The previous prime is 21354139. The next prime is 21354167. The reversal of 21354154 is 45145312.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 17413929 + 3940225 = 4173^2 + 1985^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5338537 + ... + 5338540.

Almost surely, 2^21354154 is an apocalyptic number.

21354154 is a deficient number, since it is larger than the sum of its proper divisors (10677080).

21354154 is a wasteful number, since it uses less digits than its factorization.

21354154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10677079.

The product of its digits is 2400, while the sum is 25.

The square root of 21354154 is about 4621.0555071325. The cubic root of 21354154 is about 277.4347069282.

Adding to 21354154 its reverse (45145312), we get a palindrome (66499466).

The spelling of 21354154 in words is "twenty-one million, three hundred fifty-four thousand, one hundred fifty-four".