221020121012120 has 32 divisors (see below), whose sum is σ = 497297146111920. Its totient is φ = 88407715278720.

The previous prime is 221020121012083. The next prime is 221020121012177. The reversal of 221020121012120 is 21210121020122.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 478679 + ... + 21030201.

Almost surely, 2^{221020121012120} is an apocalyptic number.

221020121012120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221020121012120 is an abundant number, since it is smaller than the sum of its proper divisors (276277025099800).

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

221020121012120 is a wasteful number, since it uses less digits than its factorization.

221020121012120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20820395 (or 20820391 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 221020121012120 its reverse (21210121020122), we get a palindrome (242230242032242).

The spelling of 221020121012120 in words is "two hundred twenty-one trillion, twenty billion, one hundred twenty-one million, twelve thousand, one hundred twenty".