29721249168 has 160 divisors (see below), whose sum is σ = 87727718400. Its totient is φ = 8595030528.

The previous prime is 29721249167. The next prime is 29721249191. The reversal of 29721249168 is 86194212792.

It is a self number, because there is not a number n which added to its sum of digits gives 29721249168.

It is not an unprimeable number, because it can be changed into a prime (29721249161) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1495843 + ... + 1515581.

It is an arithmetic number, because the mean of its divisors is an integer number (548298240).

Almost surely, 2^29721249168 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 29721249168, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43863859200).

29721249168 is an abundant number, since it is smaller than the sum of its proper divisors (58006469232).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

29721249168 is a wasteful number, since it uses less digits than its factorization.

29721249168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19909 (or 19903 counting only the distinct ones).

The product of its digits is 870912, while the sum is 51.

The spelling of 29721249168 in words is "twenty-nine billion, seven hundred twenty-one million, two hundred forty-nine thousand, one hundred sixty-eight".