221238150685 has 8 divisors (see below), whose sum is σ = 265638985560. Its totient is φ = 176888384064.

The previous prime is 221238150673. The next prime is 221238150689. The reversal of 221238150685 is 586051832122.

It can be written as a sum of positive squares in 4 ways, for example, as 49427071684 + 171811079001 = 222322^2 + 414501^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221238150685 - 2²⁵ = 221204596253 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221238150689) 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 7 ways as a sum of consecutive naturals, for example, 12757530 + ... + 12774859.

It is an arithmetic number, because the mean of its divisors is an integer number (33204873195).

Almost surely, 2^221238150685 is an apocalyptic number.

It is an amenable number.

221238150685 is a deficient number, since it is larger than the sum of its proper divisors (44400834875).

221238150685 is a wasteful number, since it uses less digits than its factorization.

221238150685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25534127.

The product of its (nonzero) digits is 230400, while the sum is 43.

The spelling of 221238150685 in words is "two hundred twenty-one billion, two hundred thirty-eight million, one hundred fifty thousand, six hundred eighty-five".