121220111221005 has 32 divisors (see below), whose sum is σ = 197138134851840. Its totient is φ = 63592946242560.

The previous prime is 121220111220983. The next prime is 121220111221007. The reversal of 121220111221005 is 500122111022121.

It is not a de Polignac number, because 121220111221005 - 2⁶ = 121220111220941 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121220111221007) 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, 130972690 + ... + 131894979.

It is an arithmetic number, because the mean of its divisors is an integer number (6160566714120).

Almost surely, 2^{121220111221005} is an apocalyptic number.

121220111221005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121220111221005 is a deficient number, since it is larger than the sum of its proper divisors (75918023630835).

121220111221005 is a wasteful number, since it uses less digits than its factorization.

121220111221005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262868181.

The product of its (nonzero) digits is 160, while the sum is 21.

Adding to 121220111221005 its reverse (500122111022121), we get a palindrome (621342222243126).

The spelling of 121220111221005 in words is "one hundred twenty-one trillion, two hundred twenty billion, one hundred eleven million, two hundred twenty-one thousand, five".