221652630 has 96 divisors (see below), whose sum is σ = 613570464. Its totient is φ = 55323648.

The previous prime is 221652623. The next prime is 221652637. The reversal of 221652630 is 36256122.

221652630 is a `hidden beast` number, since 2 + 2 + 1 + 652 + 6 + 3 + 0 = 666.

221652630 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (221652623) and next prime (221652637).

It is a junction number, because it is equal to n+sod(n) for n = 221652594 and 221652603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221652637) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 423549 + ... + 424071.

It is an arithmetic number, because the mean of its divisors is an integer number (6391359).

Almost surely, 2^221652630 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221652630, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (306785232).

221652630 is an abundant number, since it is smaller than the sum of its proper divisors (391917834).

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

221652630 is a wasteful number, since it uses less digits than its factorization.

221652630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 830 (or 827 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 221652630 is about 14888.0028882319. The cubic root of 221652630 is about 605.1889126149.

The spelling of 221652630 in words is "two hundred twenty-one million, six hundred fifty-two thousand, six hundred thirty".