21368434 has 8 divisors (see below), whose sum is σ = 32657580. Its totient is φ = 10482576.

The previous prime is 21368429. The next prime is 21368453. The reversal of 21368434 is 43486312.

It can be written as a sum of positive squares in 2 ways, for example, as 21206025 + 162409 = 4605^2 + 403^2 .

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

It is a super-2 number, since 2×21368434² = 913219943224712, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21368396 and 21368405.

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 in 3 ways as a sum of consecutive naturals, for example, 100689 + ... + 100900.

Almost surely, 2^21368434 is an apocalyptic number.

21368434 is a deficient number, since it is larger than the sum of its proper divisors (11289146).

21368434 is a wasteful number, since it uses less digits than its factorization.

21368434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201644.

The product of its digits is 13824, while the sum is 31.

The square root of 21368434 is about 4622.6003504521. The cubic root of 21368434 is about 277.4965354111.

The spelling of 21368434 in words is "twenty-one million, three hundred sixty-eight thousand, four hundred thirty-four".