21146254 has 4 divisors (see below), whose sum is σ = 31719384. Its totient is φ = 10573126.

The previous prime is 21146243. The next prime is 21146261. The reversal of 21146254 is 45264112.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 5286562 + ... + 5286565.

It is an arithmetic number, because the mean of its divisors is an integer number (7929846).

Almost surely, 2^21146254 is an apocalyptic number.

21146254 is a deficient number, since it is larger than the sum of its proper divisors (10573130).

21146254 is a wasteful number, since it uses less digits than its factorization.

21146254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10573129.

The product of its digits is 1920, while the sum is 25.

The square root of 21146254 is about 4598.5056268314. The cubic root of 21146254 is about 276.5314185484.

The spelling of 21146254 in words is "twenty-one million, one hundred forty-six thousand, two hundred fifty-four".