121000212121 has 4 divisors (see below), whose sum is σ = 121427774992. Its totient is φ = 120572649252.

The previous prime is 121000212077. The next prime is 121000212139. The reversal of 121000212121 is 121212000121.

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.

It is a cyclic number.

It is not a de Polignac number, because 121000212121 - 2¹⁹ = 120999687833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121000212191) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 213781011 + ... + 213781576.

It is an arithmetic number, because the mean of its divisors is an integer number (30356943748).

Almost surely, 2^121000212121 is an apocalyptic number.

It is an amenable number.

121000212121 is a deficient number, since it is larger than the sum of its proper divisors (427562871).

121000212121 is an equidigital number, since it uses as much as digits as its factorization.

121000212121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427562870.

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

Adding to 121000212121 its reverse (121212000121), we get a palindrome (242212212242).

The spelling of 121000212121 in words is "one hundred twenty-one billion, two hundred twelve thousand, one hundred twenty-one".