21033398 has 4 divisors (see below), whose sum is σ = 31550100. Its totient is φ = 10516698.

The previous prime is 21033391. The next prime is 21033401. The reversal of 21033398 is 89333012.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21033398.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21033391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5258348 + ... + 5258351.

It is an arithmetic number, because the mean of its divisors is an integer number (7887525).

Almost surely, 2^21033398 is an apocalyptic number.

21033398 is a deficient number, since it is larger than the sum of its proper divisors (10516702).

21033398 is a wasteful number, since it uses less digits than its factorization.

21033398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10516701.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 21033398 is about 4586.2182678106. The cubic root of 21033398 is about 276.0385981865.

The spelling of 21033398 in words is "twenty-one million, thirty-three thousand, three hundred ninety-eight".