221164630531 has 8 divisors (see below), whose sum is σ = 238281017184. Its totient is φ = 204063061440.

The previous prime is 221164630469. The next prime is 221164630597. The reversal of 221164630531 is 135036461122.

221164630531 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 221164630531 - 2¹¹ = 221164628483 is a prime.

It is a super-2 number, since 2×221164630531² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221164633531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3673375 + ... + 3733096.

It is an arithmetic number, because the mean of its divisors is an integer number (29785127148).

Almost surely, 2^221164630531 is an apocalyptic number.

221164630531 is a deficient number, since it is larger than the sum of its proper divisors (17116386653).

221164630531 is a wasteful number, since it uses less digits than its factorization.

221164630531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7408781.

The product of its (nonzero) digits is 25920, while the sum is 34.

The spelling of 221164630531 in words is "two hundred twenty-one billion, one hundred sixty-four million, six hundred thirty thousand, five hundred thirty-one".