29291921 has 2 divisors, whose sum is σ = 29291922. Its totient is φ = 29291920.

The previous prime is 29291909. The next prime is 29291923. The reversal of 29291921 is 12919292.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28472896 + 819025 = 5336^2 + 905^2 .

It is a cyclic number.

It is not a de Polignac number, because 29291921 - 2¹⁰ = 29290897 is a prime.

Together with 29291923, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (29291923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14645960 + 14645961.

It is an arithmetic number, because the mean of its divisors is an integer number (14645961).

Almost surely, 2^29291921 is an apocalyptic number.

It is an amenable number.

29291921 is a deficient number, since it is larger than the sum of its proper divisors (1).

29291921 is an equidigital number, since it uses as much as digits as its factorization.

29291921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5832, while the sum is 35.

The square root of 29291921 is about 5412.2011233878. The cubic root of 29291921 is about 308.2591321488.

The spelling of 29291921 in words is "twenty-nine million, two hundred ninety-one thousand, nine hundred twenty-one".