221121011212116 has 48 divisors (see below), whose sum is σ = 525953636208000. Its totient is φ = 72279200835712.

The previous prime is 221121011212109. The next prime is 221121011212117. The reversal of 221121011212116 is 611212110121122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221121011212117) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 87953496 + ... + 90432623.

It is an arithmetic number, because the mean of its divisors is an integer number (10957367421000).

Almost surely, 2^{221121011212116} is an apocalyptic number.

It is an amenable number.

221121011212116 is an abundant number, since it is smaller than the sum of its proper divisors (304832624995884).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221121011212116 is a wasteful number, since it uses less digits than its factorization.

221121011212116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178388128 (or 178388126 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 24.

Adding to 221121011212116 its reverse (611212110121122), we get a palindrome (832333121333238).

The spelling of 221121011212116 in words is "two hundred twenty-one trillion, one hundred twenty-one billion, eleven million, two hundred twelve thousand, one hundred sixteen".