29924937521821 has 2 divisors, whose sum is σ = 29924937521822. Its totient is φ = 29924937521820.

The previous prime is 29924937521819. The next prime is 29924937521833. The reversal of 29924937521821 is 12812573942992.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27145548399321 + 2779389122500 = 5210139^2 + 1667150^2 .

It is a cyclic number.

It is not a de Polignac number, because 29924937521821 - 2¹ = 29924937521819 is a prime.

Together with 29924937521819, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (29924937521621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14962468760910 + 14962468760911.

It is an arithmetic number, because the mean of its divisors is an integer number (14962468760911).

Almost surely, 2^{29924937521821} is an apocalyptic number.

It is an amenable number.

29924937521821 is a deficient number, since it is larger than the sum of its proper divisors (1).

29924937521821 is an equidigital number, since it uses as much as digits as its factorization.

29924937521821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 39191040, while the sum is 64.

The spelling of 29924937521821 in words is "twenty-nine trillion, nine hundred twenty-four billion, nine hundred thirty-seven million, five hundred twenty-one thousand, eight hundred twenty-one".