21035429 has 2 divisors, whose sum is σ = 21035430. Its totient is φ = 21035428.

The previous prime is 21035401. The next prime is 21035431. The reversal of 21035429 is 92453012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20702500 + 332929 = 4550^2 + 577^2 .

It is a cyclic number.

It is not a de Polignac number, because 21035429 - 2¹² = 21031333 is a prime.

It is a Sophie Germain prime.

Together with 21035431, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21035398 and 21035407.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21035449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10517714 + 10517715.

It is an arithmetic number, because the mean of its divisors is an integer number (10517715).

Almost surely, 2^21035429 is an apocalyptic number.

It is an amenable number.

21035429 is a deficient number, since it is larger than the sum of its proper divisors (1).

21035429 is an equidigital number, since it uses as much as digits as its factorization.

21035429 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 21035429 is about 4586.4396867287. The cubic root of 21035429 is about 276.0474827289.

The spelling of 21035429 in words is "twenty-one million, thirty-five thousand, four hundred twenty-nine".