20421313030655 has 4 divisors (see below), whose sum is σ = 24505575636792. Its totient is φ = 16337050424520.

The previous prime is 20421313030607. The next prime is 20421313030691. The reversal of 20421313030655 is 55603031312402.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20421313030655 - 2⁸ = 20421313030399 is a prime.

It is a super-3 number, since 3×20421313030655³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2042131303061 + ... + 2042131303070.

It is an arithmetic number, because the mean of its divisors is an integer number (6126393909198).

Almost surely, 2^{20421313030655} is an apocalyptic number.

20421313030655 is a deficient number, since it is larger than the sum of its proper divisors (4084262606137).

20421313030655 is an equidigital number, since it uses as much as digits as its factorization.

20421313030655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4084262606136.

The product of its (nonzero) digits is 64800, while the sum is 35.

The spelling of 20421313030655 in words is "twenty trillion, four hundred twenty-one billion, three hundred thirteen million, thirty thousand, six hundred fifty-five".