34121209981 has 2 divisors, whose sum is σ = 34121209982. Its totient is φ = 34121209980.

The previous prime is 34121209979. The next prime is 34121210027. The reversal of 34121209981 is 18990212143.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24763743225 + 9357466756 = 157365^2 + 96734^2 .

It is a cyclic number.

It is not a de Polignac number, because 34121209981 - 2¹ = 34121209979 is a prime.

It is a super-2 number, since 2×34121209981² (a number of 22 digits) contains 22 as substring.

Together with 34121209979, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (34121209901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17060604990 + 17060604991.

It is an arithmetic number, because the mean of its divisors is an integer number (17060604991).

Almost surely, 2^34121209981 is an apocalyptic number.

It is an amenable number.

34121209981 is a deficient number, since it is larger than the sum of its proper divisors (1).

34121209981 is an equidigital number, since it uses as much as digits as its factorization.

34121209981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 40.

The spelling of 34121209981 in words is "thirty-four billion, one hundred twenty-one million, two hundred nine thousand, nine hundred eighty-one".