221534403655121 has 8 divisors (see below), whose sum is σ = 221886618369000. Its totient is φ = 221182300926720.

The previous prime is 221534403655067. The next prime is 221534403655129. The reversal of 221534403655121 is 121556304435122.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 5425587245521 + 216108816409600 = 2329289^2 + 14700640^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221534403655121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221534403655129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24036296 + ... + 31950153.

It is an arithmetic number, because the mean of its divisors is an integer number (27735827296125).

Almost surely, 2^{221534403655121} is an apocalyptic number.

It is an amenable number.

221534403655121 is a deficient number, since it is larger than the sum of its proper divisors (352214713879).

221534403655121 is an equidigital number, since it uses as much as digits as its factorization.

221534403655121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55992739.

The product of its (nonzero) digits is 864000, while the sum is 44.

The spelling of 221534403655121 in words is "two hundred twenty-one trillion, five hundred thirty-four billion, four hundred three million, six hundred fifty-five thousand, one hundred twenty-one".