221211011018 has 4 divisors (see below), whose sum is σ = 331816516530. Its totient is φ = 110605505508.

The previous prime is 221211011017. The next prime is 221211011041. The reversal of 221211011018 is 810110112122.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 128914748209 + 92296262809 = 359047^2 + 303803^2 .

It is a super-2 number, since 2×221211011018² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (221211011017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55302752753 + ... + 55302752756.

Almost surely, 2^221211011018 is an apocalyptic number.

221211011018 is a deficient number, since it is larger than the sum of its proper divisors (110605505512).

221211011018 is a wasteful number, since it uses less digits than its factorization.

221211011018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110605505511.

The product of its (nonzero) digits is 64, while the sum is 20.

The spelling of 221211011018 in words is "two hundred twenty-one billion, two hundred eleven million, eleven thousand, eighteen".