81222081203001 has 4 divisors (see below), whose sum is σ = 108296108270672. Its totient is φ = 54148054135332.

The previous prime is 81222081202963. The next prime is 81222081203041. The reversal of 81222081203001 is 10030218022218.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 81222081203001 - 2¹⁰ = 81222081201977 is a prime.

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 81222081203001.

It is not an unprimeable number, because it can be changed into a prime (81222081203041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13537013533831 + ... + 13537013533836.

It is an arithmetic number, because the mean of its divisors is an integer number (27074027067668).

Almost surely, 2^{81222081203001} is an apocalyptic number.

It is an amenable number.

81222081203001 is a deficient number, since it is larger than the sum of its proper divisors (27074027067671).

81222081203001 is a wasteful number, since it uses less digits than its factorization.

81222081203001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27074027067670.

The product of its (nonzero) digits is 3072, while the sum is 30.

Adding to 81222081203001 its reverse (10030218022218), we get a palindrome (91252299225219).

The spelling of 81222081203001 in words is "eighty-one trillion, two hundred twenty-two billion, eighty-one million, two hundred three thousand, one".