21435338 has 8 divisors (see below), whose sum is σ = 32182500. Its totient is φ = 10707840.

The previous prime is 21435319. The next prime is 21435341. The reversal of 21435338 is 83353412.

It can be written as a sum of positive squares in 2 ways, for example, as 17698849 + 3736489 = 4207^2 + 1933^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 21435338.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1793 + ... + 6788.

Almost surely, 2^21435338 is an apocalyptic number.

21435338 is a deficient number, since it is larger than the sum of its proper divisors (10747162).

21435338 is a wasteful number, since it uses less digits than its factorization.

21435338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9832.

The product of its digits is 8640, while the sum is 29.

The square root of 21435338 is about 4629.8313144217. The cubic root of 21435338 is about 277.7858451109.

The spelling of 21435338 in words is "twenty-one million, four hundred thirty-five thousand, three hundred thirty-eight".