81122222001 has 8 divisors (see below), whose sum is σ = 111652090624. Its totient is φ = 52336917360.

The previous prime is 81122221937. The next prime is 81122222003. The reversal of 81122222001 is 10022222118.

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

It is not a de Polignac number, because 81122222001 - 2⁶ = 81122221937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81122222003) 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, 436140886 + ... + 436141071.

It is an arithmetic number, because the mean of its divisors is an integer number (13956511328).

Almost surely, 2^81122222001 is an apocalyptic number.

It is an amenable number.

81122222001 is a deficient number, since it is larger than the sum of its proper divisors (30529868623).

81122222001 is a wasteful number, since it uses less digits than its factorization.

81122222001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 872281991.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 81122222001 its reverse (10022222118), we get a palindrome (91144444119).

The spelling of 81122222001 in words is "eighty-one billion, one hundred twenty-two million, two hundred twenty-two thousand, one".