21068254 has 4 divisors (see below), whose sum is σ = 31602384. Its totient is φ = 10534126.

The previous prime is 21068249. The next prime is 21068263. The reversal of 21068254 is 45286012.

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 polite number, since it can be written as a sum of consecutive naturals, namely, 5267062 + ... + 5267065.

It is an arithmetic number, because the mean of its divisors is an integer number (7900596).

Almost surely, 2^21068254 is an apocalyptic number.

21068254 is a deficient number, since it is larger than the sum of its proper divisors (10534130).

21068254 is a wasteful number, since it uses less digits than its factorization.

21068254 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10534129.

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 21068254 is about 4590.0167755685. The cubic root of 21068254 is about 276.1909953626.

The spelling of 21068254 in words is "twenty-one million, sixty-eight thousand, two hundred fifty-four".