21298830 has 48 divisors (see below), whose sum is σ = 59466960. Its totient is φ = 4867968.

The previous prime is 21298819. The next prime is 21298859. The reversal of 21298830 is 3889212.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21298791 and 21298800.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5775 + ... + 8714.

It is an arithmetic number, because the mean of its divisors is an integer number (1238895).

Almost surely, 2^21298830 is an apocalyptic number.

21298830 is an abundant number, since it is smaller than the sum of its proper divisors (38168130).

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

21298830 is a wasteful number, since it uses less digits than its factorization.

21298830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14513 (or 14506 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 21298830 is about 4615.0655466634. The cubic root of 21298830 is about 277.1949085893.

The spelling of 21298830 in words is "twenty-one million, two hundred ninety-eight thousand, eight hundred thirty".