21030898 has 24 divisors (see below), whose sum is σ = 37256112. Its totient is φ = 8875944.

The previous prime is 21030881. The next prime is 21030899. The reversal of 21030898 is 89803012.

It is not an unprimeable number, because it can be changed into a prime (21030899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4965 + ... + 8167.

It is an arithmetic number, because the mean of its divisors is an integer number (1552338).

Almost surely, 2^21030898 is an apocalyptic number.

21030898 is a deficient number, since it is larger than the sum of its proper divisors (16225214).

21030898 is a wasteful number, since it uses less digits than its factorization.

21030898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3286 (or 3279 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 21030898 is about 4585.9457039961. The cubic root of 21030898 is about 276.0276612338.

The spelling of 21030898 in words is "twenty-one million, thirty thousand, eight hundred ninety-eight".