221908430 has 16 divisors (see below), whose sum is σ = 400137840. Its totient is φ = 88607232.

The previous prime is 221908411. The next prime is 221908433. The reversal of 221908430 is 34809122.

It is a junction number, because it is equal to n+sod(n) for n = 221908393 and 221908402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221908433) 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, 13460 + ... + 24999.

It is an arithmetic number, because the mean of its divisors is an integer number (25008615).

Almost surely, 2^221908430 is an apocalyptic number.

221908430 is a deficient number, since it is larger than the sum of its proper divisors (178229410).

221908430 is a wasteful number, since it uses less digits than its factorization.

221908430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39043.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 221908430 is about 14896.5912208129. The cubic root of 221908430 is about 605.4216308247.

The spelling of 221908430 in words is "two hundred twenty-one million, nine hundred eight thousand, four hundred thirty".