29271425921 has 2 divisors, whose sum is σ = 29271425922. Its totient is φ = 29271425920.

The previous prime is 29271425873. The next prime is 29271425923. The reversal of 29271425921 is 12952417292.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26785904896 + 2485521025 = 163664^2 + 49855^2 .

It is a cyclic number.

It is not a de Polignac number, because 29271425921 - 2⁶ = 29271425857 is a prime.

Together with 29271425923, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (29271425923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14635712960 + 14635712961.

It is an arithmetic number, because the mean of its divisors is an integer number (14635712961).

Almost surely, 2^29271425921 is an apocalyptic number.

It is an amenable number.

29271425921 is a deficient number, since it is larger than the sum of its proper divisors (1).

29271425921 is an equidigital number, since it uses as much as digits as its factorization.

29271425921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 181440, while the sum is 44.

The spelling of 29271425921 in words is "twenty-nine billion, two hundred seventy-one million, four hundred twenty-five thousand, nine hundred twenty-one".