221266155 has 16 divisors (see below), whose sum is σ = 386210304. Its totient is φ = 107280480.

The previous prime is 221266151. The next prime is 221266159. The reversal of 221266155 is 551662122.

It is an interprime number because it is at equal distance from previous prime (221266151) and next prime (221266159).

It is not a de Polignac number, because 221266155 - 2² = 221266151 is a prime.

It is a super-2 number, since 2×221266155² = 97917422696968050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (221266151) 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, 670339 + ... + 670668.

It is an arithmetic number, because the mean of its divisors is an integer number (24138144).

Almost surely, 2^221266155 is an apocalyptic number.

221266155 is a deficient number, since it is larger than the sum of its proper divisors (164944149).

221266155 is a wasteful number, since it uses less digits than its factorization.

221266155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1341026.

The product of its digits is 7200, while the sum is 30.

The square root of 221266155 is about 14875.0178151154. The cubic root of 221266155 is about 604.8369708484.

The spelling of 221266155 in words is "two hundred twenty-one million, two hundred sixty-six thousand, one hundred fifty-five".