134347367821 has 2 divisors, whose sum is σ = 134347367822. Its totient is φ = 134347367820.

The previous prime is 134347367801. The next prime is 134347367827. The reversal of 134347367821 is 128763743431.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 110765158596 + 23582209225 = 332814^2 + 153565^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-134347367821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (134347367827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67173683910 + 67173683911.

It is an arithmetic number, because the mean of its divisors is an integer number (67173683911).

Almost surely, 2^134347367821 is an apocalyptic number.

It is an amenable number.

134347367821 is a deficient number, since it is larger than the sum of its proper divisors (1).

134347367821 is an equidigital number, since it uses as much as digits as its factorization.

134347367821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2032128, while the sum is 49.

The spelling of 134347367821 in words is "one hundred thirty-four billion, three hundred forty-seven million, three hundred sixty-seven thousand, eight hundred twenty-one".