29748203521 has 4 divisors (see below), whose sum is σ = 29982441472. Its totient is φ = 29513965572.

The previous prime is 29748203467. The next prime is 29748203549. The reversal of 29748203521 is 12530284792.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-29748203521 is a prime.

It is a super-2 number, since 2×29748203521² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (29748209521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 117118785 + ... + 117119038.

It is an arithmetic number, because the mean of its divisors is an integer number (7495610368).

Almost surely, 2^29748203521 is an apocalyptic number.

It is an amenable number.

29748203521 is a deficient number, since it is larger than the sum of its proper divisors (234237951).

29748203521 is a wasteful number, since it uses less digits than its factorization.

29748203521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234237950.

The product of its (nonzero) digits is 241920, while the sum is 43.

The spelling of 29748203521 in words is "twenty-nine billion, seven hundred forty-eight million, two hundred three thousand, five hundred twenty-one".