21030798 has 8 divisors (see below), whose sum is σ = 42061608. Its totient is φ = 7010264.

The previous prime is 21030797. The next prime is 21030857. The reversal of 21030798 is 89703012.

It is a happy number.

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

21030798 is an admirable number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21030791) 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, 1752561 + ... + 1752572.

It is an arithmetic number, because the mean of its divisors is an integer number (5257701).

Almost surely, 2^21030798 is an apocalyptic number.

21030798 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21030798 is a wasteful number, since it uses less digits than its factorization.

21030798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3505138.

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 21030798 is about 4585.9348011065. The cubic root of 21030798 is about 276.0272237377.

The spelling of 21030798 in words is "twenty-one million, thirty thousand, seven hundred ninety-eight".