20512421366 has 16 divisors (see below), whose sum is σ = 31098341664. Its totient is φ = 10146506304.

The previous prime is 20512421327. The next prime is 20512421399. The reversal of 20512421366 is 66312421502.

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, 159530 + ... + 257826.

It is an arithmetic number, because the mean of its divisors is an integer number (1943646354).

Almost surely, 2^20512421366 is an apocalyptic number.

20512421366 is a deficient number, since it is larger than the sum of its proper divisors (10585920298).

20512421366 is a wasteful number, since it uses less digits than its factorization.

20512421366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99415.

The product of its (nonzero) digits is 17280, while the sum is 32.

Adding to 20512421366 its reverse (66312421502), we get a palindrome (86824842868).

The spelling of 20512421366 in words is "twenty billion, five hundred twelve million, four hundred twenty-one thousand, three hundred sixty-six".