21165425334 has 16 divisors (see below), whose sum is σ = 47034278640. Its totient is φ = 7055141760.

The previous prime is 21165425329. The next prime is 21165425339. The reversal of 21165425334 is 43352456112.

21165425334 is a `hidden beast` number, since 2 + 116 + 5 + 4 + 2 + 533 + 4 = 666.

It is an interprime number because it is at equal distance from previous prime (21165425329) and next prime (21165425339).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21165425339) 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 in 7 ways as a sum of consecutive naturals, for example, 195976107 + ... + 195976214.

It is an arithmetic number, because the mean of its divisors is an integer number (2939642415).

Almost surely, 2^21165425334 is an apocalyptic number.

21165425334 is an abundant number, since it is smaller than the sum of its proper divisors (25868853306).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21165425334 is a wasteful number, since it uses less digits than its factorization.

21165425334 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 391952332 (or 391952326 counting only the distinct ones).

The product of its digits is 86400, while the sum is 36.

The spelling of 21165425334 in words is "twenty-one billion, one hundred sixty-five million, four hundred twenty-five thousand, three hundred thirty-four".