121220112000021 has 32 divisors (see below), whose sum is σ = 163277886144000. Its totient is φ = 79993081986048.

The previous prime is 121220112000007. The next prime is 121220112000101. The reversal of 121220112000021 is 120000211022121.

It is not a de Polignac number, because 121220112000021 - 2¹⁸ = 121220111737877 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121220112002021) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 100048125 + ... + 101252493.

It is an arithmetic number, because the mean of its divisors is an integer number (5102433942000).

Almost surely, 2^{121220112000021} is an apocalyptic number.

It is an amenable number.

121220112000021 is a deficient number, since it is larger than the sum of its proper divisors (42057774143979).

121220112000021 is a wasteful number, since it uses less digits than its factorization.

121220112000021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1205453.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 121220112000021 its reverse (120000211022121), we get a palindrome (241220323022142).

The spelling of 121220112000021 in words is "one hundred twenty-one trillion, two hundred twenty billion, one hundred twelve million, twenty-one", and thus it is an aban number.