1221175171641 has 8 divisors (see below), whose sum is σ = 1628258859360. Its totient is φ = 814104132512.

The previous prime is 1221175171639. The next prime is 1221175171651. The reversal of 1221175171641 is 1461715711221.

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 1221175171641 - 2¹ = 1221175171639 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1221175171641.

It is not an unprimeable number, because it can be changed into a prime (1221175171651) 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, 2934531 + ... + 3324728.

It is an arithmetic number, because the mean of its divisors is an integer number (203532357420).

Almost surely, 2^{1221175171641} is an apocalyptic number.

It is an amenable number.

1221175171641 is a deficient number, since it is larger than the sum of its proper divisors (407083687719).

1221175171641 is an equidigital number, since it uses as much as digits as its factorization.

1221175171641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6324295.

The product of its digits is 23520, while the sum is 39.

The spelling of 1221175171641 in words is "one trillion, two hundred twenty-one billion, one hundred seventy-five million, one hundred seventy-one thousand, six hundred forty-one".