29973595021 has 2 divisors, whose sum is σ = 29973595022. Its totient is φ = 29973595020.

The previous prime is 29973594923. The next prime is 29973595049. The reversal of 29973595021 is 12059537992.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18008298025 + 11965296996 = 134195^2 + 109386^2 .

It is a cyclic number.

It is not a de Polignac number, because 29973595021 - 2¹³ = 29973586829 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 29973595021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (29973595621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14986797510 + 14986797511.

It is an arithmetic number, because the mean of its divisors is an integer number (14986797511).

Almost surely, 2^29973595021 is an apocalyptic number.

It is an amenable number.

29973595021 is a deficient number, since it is larger than the sum of its proper divisors (1).

29973595021 is an equidigital number, since it uses as much as digits as its factorization.

29973595021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1530900, while the sum is 52.

The spelling of 29973595021 in words is "twenty-nine billion, nine hundred seventy-three million, five hundred ninety-five thousand, twenty-one".