29308421 has 2 divisors, whose sum is σ = 29308422. Its totient is φ = 29308420.

The previous prime is 29308387. The next prime is 29308429. The reversal of 29308421 is 12480392.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25867396 + 3441025 = 5086^2 + 1855^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-29308421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (29308429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14654210 + 14654211.

It is an arithmetic number, because the mean of its divisors is an integer number (14654211).

Almost surely, 2^29308421 is an apocalyptic number.

It is an amenable number.

29308421 is a deficient number, since it is larger than the sum of its proper divisors (1).

29308421 is an equidigital number, since it uses as much as digits as its factorization.

29308421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 29308421 is about 5413.7252423816. The cubic root of 29308421 is about 308.3170015861.

The spelling of 29308421 in words is "twenty-nine million, three hundred eight thousand, four hundred twenty-one".