2129333047981 has 2 divisors, whose sum is σ = 2129333047982. Its totient is φ = 2129333047980.

The previous prime is 2129333047979. The next prime is 2129333048039. The reversal of 2129333047981 is 1897403339212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1163181663081 + 966151384900 = 1078509^2 + 982930^2 .

It is a cyclic number.

It is not a de Polignac number, because 2129333047981 - 2¹ = 2129333047979 is a prime.

It is a super-2 number, since 2×2129333047981² (a number of 25 digits) contains 22 as substring.

Together with 2129333047979, 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 (2129333047481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1064666523990 + 1064666523991.

It is an arithmetic number, because the mean of its divisors is an integer number (1064666523991).

Almost surely, 2^{2129333047981} is an apocalyptic number.

It is an amenable number.

2129333047981 is a deficient number, since it is larger than the sum of its proper divisors (1).

2129333047981 is an equidigital number, since it uses as much as digits as its factorization.

2129333047981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1959552, while the sum is 52.

The spelling of 2129333047981 in words is "two trillion, one hundred twenty-nine billion, three hundred thirty-three million, forty-seven thousand, nine hundred eighty-one".