221312010 has 32 divisors (see below), whose sum is σ = 532622592. Its totient is φ = 58852800.

The previous prime is 221311991. The next prime is 221312011. The reversal of 221312010 is 10213122.

It is not an unprimeable number, because it can be changed into a prime (221312011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 960 + ... + 21060.

It is an arithmetic number, because the mean of its divisors is an integer number (16644456).

Almost surely, 2^221312010 is an apocalyptic number.

221312010 is an abundant number, since it is smaller than the sum of its proper divisors (311310582).

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

221312010 is a wasteful number, since it uses less digits than its factorization.

221312010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20478.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 221312010 is about 14876.5590779589. The cubic root of 221312010 is about 604.8787499200.

Adding to 221312010 its reverse (10213122), we get a palindrome (231525132).

The spelling of 221312010 in words is "two hundred twenty-one million, three hundred twelve thousand, ten".