221356135 has 64 divisors (see below), whose sum is σ = 364621824. Its totient is φ = 124531200.

The previous prime is 221356097. The next prime is 221356189. The reversal of 221356135 is 531653122.

It is not a de Polignac number, because 221356135 - 2¹³ = 221347943 is a prime.

It is a congruent number.

It is an unprimeable number.

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 63 ways as a sum of consecutive naturals, for example, 234765 + ... + 235705.

It is an arithmetic number, because the mean of its divisors is an integer number (5697216).

Almost surely, 2^221356135 is an apocalyptic number.

221356135 is the 9410-th heptagonal number.

221356135 is a deficient number, since it is larger than the sum of its proper divisors (143265689).

221356135 is a wasteful number, since it uses less digits than its factorization.

221356135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1024.

The product of its digits is 5400, while the sum is 28.

The square root of 221356135 is about 14878.0420418817. The cubic root of 221356135 is about 604.9189473186.

The spelling of 221356135 in words is "two hundred twenty-one million, three hundred fifty-six thousand, one hundred thirty-five".