21667230 has 64 divisors (see below), whose sum is σ = 62233920. Its totient is φ = 5332608.

The previous prime is 21667223. The next prime is 21667253. The reversal of 21667230 is 3276612.

21667230 = T₁₀₃ + T₁₀₄ + ... + T₅₀₇.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 21667194 and 21667203.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 424 + ... + 6596.

It is an arithmetic number, because the mean of its divisors is an integer number (972405).

Almost surely, 2^21667230 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21667230, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31116960).

21667230 is an abundant number, since it is smaller than the sum of its proper divisors (40566690).

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

21667230 is a wasteful number, since it uses less digits than its factorization.

21667230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6202 (or 6196 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 27.

The square root of 21667230 is about 4654.8071925698. The cubic root of 21667230 is about 278.7839696648.

The spelling of 21667230 in words is "twenty-one million, six hundred sixty-seven thousand, two hundred thirty".