21246071 has 8 divisors (see below), whose sum is σ = 26488704. Its totient is φ = 16555320.

The previous prime is 21246053. The next prime is 21246079. The reversal of 21246071 is 17064212.

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

It is a cyclic number.

It is not a de Polignac number, because 21246071 - 2¹⁸ = 20983927 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21246079) 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 7 ways as a sum of consecutive naturals, for example, 137885 + ... + 138038.

It is an arithmetic number, because the mean of its divisors is an integer number (3311088).

Almost surely, 2^21246071 is an apocalyptic number.

21246071 is a deficient number, since it is larger than the sum of its proper divisors (5242633).

21246071 is a wasteful number, since it uses less digits than its factorization.

21246071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275941.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 21246071 is about 4609.3460490616. The cubic root of 21246071 is about 276.9658409484.

The spelling of 21246071 in words is "twenty-one million, two hundred forty-six thousand, seventy-one".