121220111221072 has 20 divisors (see below), whose sum is σ = 239861071141056. Its totient is φ = 59320479958880.

The previous prime is 121220111221031. The next prime is 121220111221073. The reversal of 121220111221072 is 270122111022121.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121220111221073) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 80598477454 + ... + 80598478957.

Almost surely, 2^{121220111221072} is an apocalyptic number.

It is an amenable number.

121220111221072 is a deficient number, since it is larger than the sum of its proper divisors (118640959919984).

121220111221072 is a wasteful number, since it uses less digits than its factorization.

121220111221072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161196956466 (or 161196956460 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 25.

Adding to 121220111221072 its reverse (270122111022121), we get a palindrome (391342222243193).

The spelling of 121220111221072 in words is "one hundred twenty-one trillion, two hundred twenty billion, one hundred eleven million, two hundred twenty-one thousand, seventy-two".