121204213423 has 2 divisors, whose sum is σ = 121204213424. Its totient is φ = 121204213422.

The previous prime is 121204213409. The next prime is 121204213433. The reversal of 121204213423 is 324312402121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 121204213423 - 2¹³ = 121204205231 is a prime.

It is a super-2 number, since 2×121204213423² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121204213433) 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 as a sum of consecutive naturals, namely, 60602106711 + 60602106712.

It is an arithmetic number, because the mean of its divisors is an integer number (60602106712).

Almost surely, 2^121204213423 is an apocalyptic number.

121204213423 is a deficient number, since it is larger than the sum of its proper divisors (1).

121204213423 is an equidigital number, since it uses as much as digits as its factorization.

121204213423 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 121204213423 its reverse (324312402121), we get a palindrome (445516615544).

The spelling of 121204213423 in words is "one hundred twenty-one billion, two hundred four million, two hundred thirteen thousand, four hundred twenty-three".