85011072221 has 4 divisors (see below), whose sum is σ = 89485339200. Its totient is φ = 80536805244.

The previous prime is 85011072217. The next prime is 85011072299. The reversal of 85011072221 is 12227011058.

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 a cyclic number.

It is not a de Polignac number, because 85011072221 - 2² = 85011072217 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85011072121) 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, 2237133461 + ... + 2237133498.

It is an arithmetic number, because the mean of its divisors is an integer number (22371334800).

Almost surely, 2^85011072221 is an apocalyptic number.

It is an amenable number.

85011072221 is a deficient number, since it is larger than the sum of its proper divisors (4474266979).

85011072221 is a wasteful number, since it uses less digits than its factorization.

85011072221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4474266978.

The product of its (nonzero) digits is 2240, while the sum is 29.

Adding to 85011072221 its reverse (12227011058), we get a palindrome (97238083279).

The spelling of 85011072221 in words is "eighty-five billion, eleven million, seventy-two thousand, two hundred twenty-one".