21095429 has 2 divisors, whose sum is σ = 21095430. Its totient is φ = 21095428.

The previous prime is 21095423. The next prime is 21095461. The reversal of 21095429 is 92459012.

It is an a-pointer prime, because the next prime (21095461) can be obtained adding 21095429 to its sum of digits (32).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17447329 + 3648100 = 4177^2 + 1910^2 .

It is a cyclic number.

It is not a de Polignac number, because 21095429 - 2¹² = 21091333 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21095395 and 21095404.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21095423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10547714 + 10547715.

It is an arithmetic number, because the mean of its divisors is an integer number (10547715).

Almost surely, 2^21095429 is an apocalyptic number.

It is an amenable number.

21095429 is a deficient number, since it is larger than the sum of its proper divisors (1).

21095429 is an equidigital number, since it uses as much as digits as its factorization.

21095429 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 21095429 is about 4592.9760504492. The cubic root of 21095429 is about 276.3096931533.

The spelling of 21095429 in words is "twenty-one million, ninety-five thousand, four hundred twenty-nine".