29289945721 has 4 divisors (see below), whose sum is σ = 29295634932. Its totient is φ = 29284256512.

The previous prime is 29289945719. The next prime is 29289945739. The reversal of 29289945721 is 12754998292.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17285675625 + 12004270096 = 131475^2 + 109564^2 .

It is a cyclic number.

It is not a de Polignac number, because 29289945721 - 2¹ = 29289945719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (29289943721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2836876 + ... + 2847181.

It is an arithmetic number, because the mean of its divisors is an integer number (7323908733).

Almost surely, 2^29289945721 is an apocalyptic number.

It is an amenable number.

29289945721 is a deficient number, since it is larger than the sum of its proper divisors (5689211).

29289945721 is an equidigital number, since it uses as much as digits as its factorization.

29289945721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5689210.

The product of its digits is 6531840, while the sum is 58.

The spelling of 29289945721 in words is "twenty-nine billion, two hundred eighty-nine million, nine hundred forty-five thousand, seven hundred twenty-one".