29240021 has 2 divisors, whose sum is σ = 29240022. Its totient is φ = 29240020.

The previous prime is 29239981. The next prime is 29240023. The reversal of 29240021 is 12004292.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18748900 + 10491121 = 4330^2 + 3239^2 .

It is a cyclic number.

It is not a de Polignac number, because 29240021 - 2²² = 25045717 is a prime.

Together with 29240023, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 29239975 and 29240002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (29240023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14620010 + 14620011.

It is an arithmetic number, because the mean of its divisors is an integer number (14620011).

Almost surely, 2^29240021 is an apocalyptic number.

It is an amenable number.

29240021 is a deficient number, since it is larger than the sum of its proper divisors (1).

29240021 is an equidigital number, since it uses as much as digits as its factorization.

29240021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 29240021 is about 5407.4042756206. The cubic root of 29240021 is about 308.0769646588.

The spelling of 29240021 in words is "twenty-nine million, two hundred forty thousand, twenty-one".