21425633959 has 2 divisors, whose sum is σ = 21425633960. Its totient is φ = 21425633958.

The previous prime is 21425633947. The next prime is 21425633989. The reversal of 21425633959 is 95933652412.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21425633959 - 2²¹ = 21423536807 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21425633909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10712816979 + 10712816980.

It is an arithmetic number, because the mean of its divisors is an integer number (10712816980).

Almost surely, 2^21425633959 is an apocalyptic number.

21425633959 is a deficient number, since it is larger than the sum of its proper divisors (1).

21425633959 is an equidigital number, since it uses as much as digits as its factorization.

21425633959 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1749600, while the sum is 49.

The spelling of 21425633959 in words is "twenty-one billion, four hundred twenty-five million, six hundred thirty-three thousand, nine hundred fifty-nine".