21368470 has 16 divisors (see below), whose sum is σ = 38742480. Its totient is φ = 8485344.

The previous prime is 21368461. The next prime is 21368471. The reversal of 21368470 is 7486312.

It is a super-2 number, since 2×21368470² = 913223020281800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21368471) 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, 6297 + ... + 9076.

It is an arithmetic number, because the mean of its divisors is an integer number (2421405).

Almost surely, 2^21368470 is an apocalyptic number.

21368470 is a deficient number, since it is larger than the sum of its proper divisors (17374010).

21368470 is a wasteful number, since it uses less digits than its factorization.

21368470 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15519.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 21368470 is about 4622.6042443627. The cubic root of 21368470 is about 277.4966912464.

The spelling of 21368470 in words is "twenty-one million, three hundred sixty-eight thousand, four hundred seventy".