29116421 has 2 divisors, whose sum is σ = 29116422. Its totient is φ = 29116420.

The previous prime is 29116411. The next prime is 29116429. The reversal of 29116421 is 12461192.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25391521 + 3724900 = 5039^2 + 1930^2 .

It is a cyclic number.

It is not a de Polignac number, because 29116421 - 2⁶ = 29116357 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (29116429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14558210 + 14558211.

It is an arithmetic number, because the mean of its divisors is an integer number (14558211).

Almost surely, 2^29116421 is an apocalyptic number.

It is an amenable number.

29116421 is a deficient number, since it is larger than the sum of its proper divisors (1).

29116421 is an equidigital number, since it uses as much as digits as its factorization.

29116421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864, while the sum is 26.

The square root of 29116421 is about 5395.9633986898. The cubic root of 29116421 is about 307.6422625931.

The spelling of 29116421 in words is "twenty-nine million, one hundred sixteen thousand, four hundred twenty-one".