29529923221 has 8 divisors (see below), whose sum is σ = 30398087384. Its totient is φ = 28665446400.

The previous prime is 29529923209. The next prime is 29529923257. The reversal of 29529923221 is 12232992592.

It is the 70155-th star number.

It can be written as a sum of positive squares in 4 ways, for example, as 1561040100 + 27968883121 = 39510^2 + 167239^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a 10-Lehmer number, since φ(29529923221) divides (29529923221-1)¹⁰.

It is a cyclic number.

It is not a de Polignac number, because 29529923221 - 2¹¹ = 29529921173 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (29529923201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 905580 + ... + 937621.

It is an arithmetic number, because the mean of its divisors is an integer number (3799760923).

Almost surely, 2^29529923221 is an apocalyptic number.

It is an amenable number.

29529923221 is a deficient number, since it is larger than the sum of its proper divisors (868164163).

29529923221 is a wasteful number, since it uses less digits than its factorization.

29529923221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1843671.

The product of its digits is 349920, while the sum is 46.

The spelling of 29529923221 in words is "twenty-nine billion, five hundred twenty-nine million, nine hundred twenty-three thousand, two hundred twenty-one".