29747749821 has 8 divisors (see below), whose sum is σ = 41388173760. Its totient is φ = 18969579552.

The previous prime is 29747749781. The next prime is 29747749841. The reversal of 29747749821 is 12894774792.

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

It is not a de Polignac number, because 29747749821 - 2⁹ = 29747749309 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (29747749841) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 215563336 + ... + 215563473.

It is an arithmetic number, because the mean of its divisors is an integer number (5173521720).

Almost surely, 2^29747749821 is an apocalyptic number.

It is an amenable number.

29747749821 is a deficient number, since it is larger than the sum of its proper divisors (11640423939).

29747749821 is a wasteful number, since it uses less digits than its factorization.

29747749821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 431126835.

The product of its digits is 14224896, while the sum is 60.

The spelling of 29747749821 in words is "twenty-nine billion, seven hundred forty-seven million, seven hundred forty-nine thousand, eight hundred twenty-one".