221320121232120 has 64 divisors (see below), whose sum is σ = 667669639536000. Its totient is φ = 58688985587328.

The previous prime is 221320121232107. The next prime is 221320121232137. The reversal of 221320121232120 is 21232121023122.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5151750430 + ... + 5151793389.

It is an arithmetic number, because the mean of its divisors is an integer number (10432338117750).

Almost surely, 2^{221320121232120} is an apocalyptic number.

221320121232120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221320121232120 is an abundant number, since it is smaller than the sum of its proper divisors (446349518303880).

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

221320121232120 is a wasteful number, since it uses less digits than its factorization.

221320121232120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10303544012 (or 10303544008 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

Adding to 221320121232120 its reverse (21232121023122), we get a palindrome (242552242255242).

The spelling of 221320121232120 in words is "two hundred twenty-one trillion, three hundred twenty billion, one hundred twenty-one million, two hundred thirty-two thousand, one hundred twenty".