20512421365 has 8 divisors (see below), whose sum is σ = 25187345568. Its totient is φ = 16028310480.

The previous prime is 20512421327. The next prime is 20512421399. The reversal of 20512421365 is 56312421502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-20512421365 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 47703091 + ... + 47703520.

It is an arithmetic number, because the mean of its divisors is an integer number (3148418196).

Almost surely, 2^20512421365 is an apocalyptic number.

It is an amenable number.

20512421365 is a deficient number, since it is larger than the sum of its proper divisors (4674924203).

20512421365 is an equidigital number, since it uses as much as digits as its factorization.

20512421365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95406659.

The product of its (nonzero) digits is 14400, while the sum is 31.

Adding to 20512421365 its reverse (56312421502), we get a palindrome (76824842867).

The spelling of 20512421365 in words is "twenty billion, five hundred twelve million, four hundred twenty-one thousand, three hundred sixty-five".