121020021121 has 4 divisors (see below), whose sum is σ = 121022828992. Its totient is φ = 121017213252.

The previous prime is 121020021077. The next prime is 121020021179. The reversal of 121020021121 is 121120020121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 121120020121 = 191 ⋅634136231.

It is a cyclic number.

It is not a de Polignac number, because 121020021121 - 2²³ = 121011632513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121020721121) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1338261 + ... + 1425826.

It is an arithmetic number, because the mean of its divisors is an integer number (30255707248).

Almost surely, 2^121020021121 is an apocalyptic number.

It is an amenable number.

121020021121 is a deficient number, since it is larger than the sum of its proper divisors (2807871).

121020021121 is an equidigital number, since it uses as much as digits as its factorization.

121020021121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2807870.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 121020021121 its reverse (121120020121), we get a palindrome (242140041242).

It can be divided in two parts, 1210200 and 21121, that added together give a palindrome (1231321).

The spelling of 121020021121 in words is "one hundred twenty-one billion, twenty million, twenty-one thousand, one hundred twenty-one".