121012112121 has 4 divisors (see below), whose sum is σ = 161349482832. Its totient is φ = 80674741412.

The previous prime is 121012112113. The next prime is 121012112141. The reversal of 121012112121 is 121211210121.

It is a happy number.

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: 121211210121 = 3 ⋅40403736707.

It is a cyclic number.

It is not a de Polignac number, because 121012112121 - 2³ = 121012112113 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121012112121.

It is not an unprimeable number, because it can be changed into a prime (121012112141) 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, 20168685351 + ... + 20168685356.

It is an arithmetic number, because the mean of its divisors is an integer number (40337370708).

Almost surely, 2^121012112121 is an apocalyptic number.

It is an amenable number.

121012112121 is a deficient number, since it is larger than the sum of its proper divisors (40337370711).

121012112121 is an equidigital number, since it uses as much as digits as its factorization.

121012112121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40337370710.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 121012112121 its reverse (121211210121), we get a palindrome (242223322242).

It can be divided in two parts, 1210121 and 12121, that multiplied together give a palindrome (14667876641).

The spelling of 121012112121 in words is "one hundred twenty-one billion, twelve million, one hundred twelve thousand, one hundred twenty-one".