221694630 has 32 divisors (see below), whose sum is σ = 532774368. Its totient is φ = 59040000.

The previous prime is 221694593. The next prime is 221694643. The reversal of 221694630 is 36496122.

It is a junction number, because it is equal to n+sod(n) for n = 221694591 and 221694600.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20130 + ... + 29130.

It is an arithmetic number, because the mean of its divisors is an integer number (16649199).

Almost surely, 2^221694630 is an apocalyptic number.

221694630 is an abundant number, since it is smaller than the sum of its proper divisors (311079738).

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

221694630 is a wasteful number, since it uses less digits than its factorization.

221694630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9832.

The product of its (nonzero) digits is 15552, while the sum is 33.

The square root of 221694630 is about 14889.4133531177. The cubic root of 221694630 is about 605.2271350789.

The spelling of 221694630 in words is "two hundred twenty-one million, six hundred ninety-four thousand, six hundred thirty".