21059629 has 2 divisors, whose sum is σ = 21059630. Its totient is φ = 21059628.

The previous prime is 21059593. The next prime is 21059669. The reversal of 21059629 is 92695012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12638025 + 8421604 = 3555^2 + 2902^2 .

It is a cyclic number.

It is not a de Polignac number, because 21059629 - 2¹⁵ = 21026861 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21059594 and 21059603.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21059669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10529814 + 10529815.

It is an arithmetic number, because the mean of its divisors is an integer number (10529815).

Almost surely, 2^21059629 is an apocalyptic number.

It is an amenable number.

21059629 is a deficient number, since it is larger than the sum of its proper divisors (1).

21059629 is an equidigital number, since it uses as much as digits as its factorization.

21059629 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 21059629 is about 4589.0771403410. The cubic root of 21059629 is about 276.1533008535.

The spelling of 21059629 in words is "twenty-one million, fifty-nine thousand, six hundred twenty-nine".