221012270 has 16 divisors (see below), whose sum is σ = 398116080. Its totient is φ = 88339584.

The previous prime is 221012261. The next prime is 221012273. The reversal of 221012270 is 72210122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221012273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7469 + ... + 22311.

It is an arithmetic number, because the mean of its divisors is an integer number (24882255).

Almost surely, 2^221012270 is an apocalyptic number.

221012270 is a deficient number, since it is larger than the sum of its proper divisors (177103810).

221012270 is a wasteful number, since it uses less digits than its factorization.

221012270 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16339.

The product of its (nonzero) digits is 112, while the sum is 17.

The square root of 221012270 is about 14866.4814263497. The cubic root of 221012270 is about 604.6055484934.

Adding to 221012270 its reverse (72210122), we get a palindrome (293222392).

The spelling of 221012270 in words is "two hundred twenty-one million, twelve thousand, two hundred seventy".