21035459 has 2 divisors, whose sum is σ = 21035460. Its totient is φ = 21035458.

The previous prime is 21035449. The next prime is 21035491. The reversal of 21035459 is 95453012.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21035459 is a prime.

It is not a weakly prime, because it can be changed into another prime (21035429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10517729 + 10517730.

It is an arithmetic number, because the mean of its divisors is an integer number (10517730).

Almost surely, 2^21035459 is an apocalyptic number.

21035459 is a deficient number, since it is larger than the sum of its proper divisors (1).

21035459 is an equidigital number, since it uses as much as digits as its factorization.

21035459 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 21035459 is about 4586.4429572382. The cubic root of 21035459 is about 276.0476139586.

The spelling of 21035459 in words is "twenty-one million, thirty-five thousand, four hundred fifty-nine".