81054168200121 has 8 divisors (see below), whose sum is σ = 109903956881760. Its totient is φ = 53120245825952.

The previous prime is 81054168200111. The next prime is 81054168200129. The reversal of 81054168200121 is 12100286145018.

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 81054168200121 - 2¹⁵ = 81054168167353 is a prime.

It is a super-2 number, since 2×81054168200121² (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 81054168200121.

It is not an unprimeable number, because it can be changed into a prime (81054168200129) 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, 228966576660 + ... + 228966577013.

It is an arithmetic number, because the mean of its divisors is an integer number (13737994610220).

Almost surely, 2^{81054168200121} is an apocalyptic number.

It is an amenable number.

81054168200121 is a deficient number, since it is larger than the sum of its proper divisors (28849788681639).

81054168200121 is a wasteful number, since it uses less digits than its factorization.

81054168200121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 457933153735.

The product of its (nonzero) digits is 30720, while the sum is 39.

The spelling of 81054168200121 in words is "eighty-one trillion, fifty-four billion, one hundred sixty-eight million, two hundred thousand, one hundred twenty-one".