121220021999999 has 24 divisors (see below), whose sum is σ = 134692451774496. Its totient is φ = 108443290464000.

The previous prime is 121220021999911. The next prime is 121220022000061. The reversal of 121220021999999 is 999999120022121.

It is not a de Polignac number, because 121220021999999 - 2⁸ = 121220021999743 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121220021909999) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15067964 + ... + 21667569.

It is an arithmetic number, because the mean of its divisors is an integer number (5612185490604).

Almost surely, 2^{121220021999999} is an apocalyptic number.

121220021999999 is a deficient number, since it is larger than the sum of its proper divisors (13472429774497).

121220021999999 is a wasteful number, since it uses less digits than its factorization.

121220021999999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36735779 (or 36735738 counting only the distinct ones).

The product of its (nonzero) digits is 8503056, while the sum is 65.

The spelling of 121220021999999 in words is "one hundred twenty-one trillion, two hundred twenty billion, twenty-one million, nine hundred ninety-nine thousand, nine hundred ninety-nine".