221636051 has 16 divisors (see below), whose sum is σ = 274176000. Its totient is φ = 174464928.

The previous prime is 221636033. The next prime is 221636057. The reversal of 221636051 is 150636122.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221636051 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221636051.

It is not an unprimeable number, because it can be changed into a prime (221636057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11990 + ... + 24228.

It is an arithmetic number, because the mean of its divisors is an integer number (17136000).

Almost surely, 2^221636051 is an apocalyptic number.

221636051 is a deficient number, since it is larger than the sum of its proper divisors (52539949).

221636051 is a wasteful number, since it uses less digits than its factorization.

221636051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12458.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 221636051 is about 14887.4460872240. The cubic root of 221636051 is about 605.1738234231.

The spelling of 221636051 in words is "two hundred twenty-one million, six hundred thirty-six thousand, fifty-one".