21246164 has 12 divisors (see below), whose sum is σ = 37214100. Its totient is φ = 10613568.

The previous prime is 21246151. The next prime is 21246167. The reversal of 21246164 is 46164212.

It can be written as a sum of positive squares in 2 ways, for example, as 8940100 + 12306064 = 2990^2 + 3508^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21246167) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5672 + ... + 8640.

It is an arithmetic number, because the mean of its divisors is an integer number (3101175).

Almost surely, 2^21246164 is an apocalyptic number.

It is an amenable number.

21246164 is a deficient number, since it is larger than the sum of its proper divisors (15967936).

21246164 is a wasteful number, since it uses less digits than its factorization.

21246164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4762 (or 4760 counting only the distinct ones).

The product of its digits is 2304, while the sum is 26.

The square root of 21246164 is about 4609.3561372495. The cubic root of 21246164 is about 276.9662450668.

The spelling of 21246164 in words is "twenty-one million, two hundred forty-six thousand, one hundred sixty-four".