121421404123 has 4 divisors (see below), whose sum is σ = 127812004360. Its totient is φ = 115030803888.

The previous prime is 121421404099. The next prime is 121421404171. The reversal of 121421404123 is 321404124121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 121421404123 - 2²¹ = 121419306971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121421464123) 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, 3195300090 + ... + 3195300127.

It is an arithmetic number, because the mean of its divisors is an integer number (31953001090).

Almost surely, 2^121421404123 is an apocalyptic number.

121421404123 is a deficient number, since it is larger than the sum of its proper divisors (6390600237).

121421404123 is an equidigital number, since it uses as much as digits as its factorization.

121421404123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6390600236.

The product of its (nonzero) digits is 1536, while the sum is 25.

Adding to 121421404123 its reverse (321404124121), we get a palindrome (442825528244).

The spelling of 121421404123 in words is "one hundred twenty-one billion, four hundred twenty-one million, four hundred four thousand, one hundred twenty-three".