21235452659 has 2 divisors, whose sum is σ = 21235452660. Its totient is φ = 21235452658.

The previous prime is 21235452653. The next prime is 21235452677. The reversal of 21235452659 is 95625453212.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21235452659 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (21235452653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10617726329 + 10617726330.

It is an arithmetic number, because the mean of its divisors is an integer number (10617726330).

Almost surely, 2^21235452659 is an apocalyptic number.

21235452659 is a deficient number, since it is larger than the sum of its proper divisors (1).

21235452659 is an equidigital number, since it uses as much as digits as its factorization.

21235452659 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 648000, while the sum is 44.

The spelling of 21235452659 in words is "twenty-one billion, two hundred thirty-five million, four hundred fifty-two thousand, six hundred fifty-nine".