221211211120120 has 32 divisors (see below), whose sum is σ = 536011780792320. Its totient is φ = 81677985644160.

The previous prime is 221211211120117. The next prime is 221211211120139. The reversal of 221211211120120 is 21021112112122.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 212703087096 + ... + 212703088135.

It is an arithmetic number, because the mean of its divisors is an integer number (16750368149760).

Almost surely, 2^{221211211120120} is an apocalyptic number.

221211211120120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221211211120120 is an abundant number, since it is smaller than the sum of its proper divisors (314800569672200).

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

221211211120120 is a wasteful number, since it uses less digits than its factorization.

221211211120120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425406175255 (or 425406175251 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 221211211120120 its reverse (21021112112122), we get a palindrome (242232323232242).

The spelling of 221211211120120 in words is "two hundred twenty-one trillion, two hundred eleven billion, two hundred eleven million, one hundred twenty thousand, one hundred twenty".