29384989721 has 2 divisors, whose sum is σ = 29384989722. Its totient is φ = 29384989720.

The previous prime is 29384989693. The next prime is 29384989817. The reversal of 29384989721 is 12798948392.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29288557321 + 96432400 = 171139^2 + 9820^2 .

It is a cyclic number.

It is not a de Polignac number, because 29384989721 - 2²² = 29380795417 is a prime.

It is not a weakly prime, because it can be changed into another prime (29384983721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14692494860 + 14692494861.

It is an arithmetic number, because the mean of its divisors is an integer number (14692494861).

Almost surely, 2^29384989721 is an apocalyptic number.

It is an amenable number.

29384989721 is a deficient number, since it is larger than the sum of its proper divisors (1).

29384989721 is an equidigital number, since it uses as much as digits as its factorization.

29384989721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15676416, while the sum is 62.

The spelling of 29384989721 in words is "twenty-nine billion, three hundred eighty-four million, nine hundred eighty-nine thousand, seven hundred twenty-one".