134204123220421 has 2 divisors, whose sum is σ = 134204123220422. Its totient is φ = 134204123220420.

The previous prime is 134204123220407. The next prime is 134204123220437. The reversal of 134204123220421 is 124022321402431.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 133871610684100 + 332512536321 = 11570290^2 + 576639^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-134204123220421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (134204123260421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67102061610210 + 67102061610211.

It is an arithmetic number, because the mean of its divisors is an integer number (67102061610211).

Almost surely, 2^{134204123220421} is an apocalyptic number.

It is an amenable number.

134204123220421 is a deficient number, since it is larger than the sum of its proper divisors (1).

134204123220421 is an equidigital number, since it uses as much as digits as its factorization.

134204123220421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18432, while the sum is 31.

Adding to 134204123220421 its reverse (124022321402431), we get a palindrome (258226444622852).

The spelling of 134204123220421 in words is "one hundred thirty-four trillion, two hundred four billion, one hundred twenty-three million, two hundred twenty thousand, four hundred twenty-one".