20421411043455 has 32 divisors (see below), whose sum is σ = 36305051121600. Its totient is φ = 10891323110016.

The previous prime is 20421411043417. The next prime is 20421411043459. The reversal of 20421411043455 is 55434011412402.

20421411043455 is a `hidden beast` number, since 2 + 0 + 4 + 214 + 1 + 1 + 0 + 434 + 5 + 5 = 666.

It is not a de Polignac number, because 20421411043455 - 2¹⁸ = 20421410781311 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20421411043459) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16273977 + ... + 17483853.

It is an arithmetic number, because the mean of its divisors is an integer number (1134532847550).

Almost surely, 2^{20421411043455} is an apocalyptic number.

20421411043455 is a deficient number, since it is larger than the sum of its proper divisors (15883640078145).

20421411043455 is a wasteful number, since it uses less digits than its factorization.

20421411043455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1334920 (or 1334914 counting only the distinct ones).

The product of its (nonzero) digits is 76800, while the sum is 36.

Adding to 20421411043455 its reverse (55434011412402), we get a palindrome (75855422455857).

The spelling of 20421411043455 in words is "twenty trillion, four hundred twenty-one billion, four hundred eleven million, forty-three thousand, four hundred fifty-five".