221930 has 8 divisors (see below), whose sum is σ = 399492. Its totient is φ = 88768.

The previous prime is 221909. The next prime is 221941. The reversal of 221930 is 39122.

It can be written as a sum of positive squares in 2 ways, for example, as 212521 + 9409 = 461^2 + 97^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a nialpdrome in base 12.

It is a junction number, because it is equal to n+sod(n) for n = 221899 and 221908.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11087 + ... + 11106.

2²²¹⁹³⁰ is an apocalyptic number.

221930 is a deficient number, since it is larger than the sum of its proper divisors (177562).

221930 is a wasteful number, since it uses less digits than its factorization.

221930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22200.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 221930 is about 471.0944703560. The cubic root of 221930 is about 60.5441246305.

The spelling of 221930 in words is "two hundred twenty-one thousand, nine hundred thirty".