21898230 has 16 divisors (see below), whose sum is σ = 52555824. Its totient is φ = 5839520.

The previous prime is 21898189. The next prime is 21898237. The reversal of 21898230 is 3289812.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21898191 and 21898200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21898237) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 364941 + ... + 365000.

It is an arithmetic number, because the mean of its divisors is an integer number (3284739).

Almost surely, 2^21898230 is an apocalyptic number.

21898230 is an abundant number, since it is smaller than the sum of its proper divisors (30657594).

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

21898230 is a wasteful number, since it uses less digits than its factorization.

21898230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 729951.

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

The square root of 21898230 is about 4679.5544659722. The cubic root of 21898230 is about 279.7711991417.

The spelling of 21898230 in words is "twenty-one million, eight hundred ninety-eight thousand, two hundred thirty".