29311021 has 2 divisors, whose sum is σ = 29311022. Its totient is φ = 29311020.

The previous prime is 29310997. The next prime is 29311057. The reversal of 29311021 is 12011392.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21808900 + 7502121 = 4670^2 + 2739^2 .

It is a cyclic number.

It is not a de Polignac number, because 29311021 - 2⁷ = 29310893 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 29311021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (29318021) 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 as a sum of consecutive naturals, namely, 14655510 + 14655511.

It is an arithmetic number, because the mean of its divisors is an integer number (14655511).

Almost surely, 2^29311021 is an apocalyptic number.

It is an amenable number.

29311021 is a deficient number, since it is larger than the sum of its proper divisors (1).

29311021 is an equidigital number, since it uses as much as digits as its factorization.

29311021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 19.

The square root of 29311021 is about 5413.9653674548. The cubic root of 29311021 is about 308.3261184254.

The spelling of 29311021 in words is "twenty-nine million, three hundred eleven thousand, twenty-one".