221672021561156 has 96 divisors (see below), whose sum is σ = 419610830375520. Its totient is φ = 102075244544000.

The previous prime is 221672021561149. The next prime is 221672021561231. The reversal of 221672021561156 is 651165120276122.

It can be written as a sum of positive squares in 16 ways, for example, as 11189493304900 + 210482528256256 = 3345070^2 + 14508016^2 .

It is a super-2 number, since 2×221672021561156² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 221672021561156.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 12545807090 + ... + 12545824758.

It is an arithmetic number, because the mean of its divisors is an integer number (4370946149745).

Almost surely, 2^{221672021561156} is an apocalyptic number.

It is an amenable number.

221672021561156 is a deficient number, since it is larger than the sum of its proper divisors (197938808814364).

221672021561156 is a wasteful number, since it uses less digits than its factorization.

221672021561156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26825 (or 26823 counting only the distinct ones).

The product of its (nonzero) digits is 604800, while the sum is 47.

The spelling of 221672021561156 in words is "two hundred twenty-one trillion, six hundred seventy-two billion, twenty-one million, five hundred sixty-one thousand, one hundred fifty-six".