13621221172081 has 8 divisors (see below), whose sum is σ = 13856644620000. Its totient is φ = 13385949567360.

The previous prime is 13621221172057. The next prime is 13621221172093. The reversal of 13621221172081 is 18027112212631.

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 13621221172081 - 2¹³ = 13621221163889 is a prime.

It is a super-2 number, since 2×13621221172081² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13621221172081.

It is not an unprimeable number, because it can be changed into a prime (13621221122081) 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, 37779831 + ... + 38138668.

It is an arithmetic number, because the mean of its divisors is an integer number (1732080577500).

Almost surely, 2^{13621221172081} is an apocalyptic number.

It is an amenable number.

13621221172081 is a deficient number, since it is larger than the sum of its proper divisors (235423447919).

13621221172081 is an equidigital number, since it uses as much as digits as its factorization.

13621221172081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75921599.

The product of its (nonzero) digits is 16128, while the sum is 37.

The spelling of 13621221172081 in words is "thirteen trillion, six hundred twenty-one billion, two hundred twenty-one million, one hundred seventy-two thousand, eighty-one".