29997500648821 has 2 divisors, whose sum is σ = 29997500648822. Its totient is φ = 29997500648820.

The previous prime is 29997500648777. The next prime is 29997500648861. The reversal of 29997500648821 is 12884600579992.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21225324339025 + 8772176309796 = 4607095^2 + 2961786^2 .

It is a cyclic number.

It is not a de Polignac number, because 29997500648821 - 2²⁹ = 29996963777909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (29997500648861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14998750324410 + 14998750324411.

It is an arithmetic number, because the mean of its divisors is an integer number (14998750324411).

Almost surely, 2^{29997500648821} is an apocalyptic number.

It is an amenable number.

29997500648821 is a deficient number, since it is larger than the sum of its proper divisors (1).

29997500648821 is an equidigital number, since it uses as much as digits as its factorization.

29997500648821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 156764160, while the sum is 70.

The spelling of 29997500648821 in words is "twenty-nine trillion, nine hundred ninety-seven billion, five hundred million, six hundred forty-eight thousand, eight hundred twenty-one".