21425633947 has 2 divisors, whose sum is σ = 21425633948. Its totient is φ = 21425633946.

The previous prime is 21425633921. The next prime is 21425633959. The reversal of 21425633947 is 74933652412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21425633947 - 2⁷ = 21425633819 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21425633897 and 21425633906.

It is not a weakly prime, because it can be changed into another prime (21425633147) 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, 10712816973 + 10712816974.

It is an arithmetic number, because the mean of its divisors is an integer number (10712816974).

Almost surely, 2^21425633947 is an apocalyptic number.

21425633947 is a deficient number, since it is larger than the sum of its proper divisors (1).

21425633947 is an equidigital number, since it uses as much as digits as its factorization.

21425633947 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1088640, while the sum is 46.

The spelling of 21425633947 in words is "twenty-one billion, four hundred twenty-five million, six hundred thirty-three thousand, nine hundred forty-seven".