221211211985 has 32 divisors (see below), whose sum is σ = 276062487552. Its totient is φ = 170028149760.

The previous prime is 221211211943. The next prime is 221211211987. The reversal of 221211211985 is 589112112122.

It is a de Polignac number, because none of the positive numbers 2^k-221211211985 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221211211987) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5645732 + ... + 5684778.

It is an arithmetic number, because the mean of its divisors is an integer number (8626952736).

Almost surely, 2^221211211985 is an apocalyptic number.

It is an amenable number.

221211211985 is a deficient number, since it is larger than the sum of its proper divisors (54851275567).

221211211985 is a wasteful number, since it uses less digits than its factorization.

221211211985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39473.

The product of its digits is 5760, while the sum is 35.

The spelling of 221211211985 in words is "two hundred twenty-one billion, two hundred eleven million, two hundred eleven thousand, nine hundred eighty-five".