2005551434421 has 12 divisors (see below), whose sum is σ = 2899813264972. Its totient is φ = 1335693226176.

The previous prime is 2005551434417. The next prime is 2005551434423. The reversal of 2005551434421 is 1244341555002.

2005551434421 is a `hidden beast` number, since 2 + 0 + 0 + 5 + 551 + 43 + 44 + 21 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1386047063025 + 619504371396 = 1177305^2 + 787086^2 .

It is not a de Polignac number, because 2005551434421 - 2² = 2005551434417 is a prime.

It is a super-2 number, since 2×2005551434421² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2005551434423) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 111745816 + ... + 111763761.

Almost surely, 2^{2005551434421} is an apocalyptic number.

It is an amenable number.

2005551434421 is a deficient number, since it is larger than the sum of its proper divisors (894261830551).

2005551434421 is a wasteful number, since it uses less digits than its factorization.

2005551434421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223510580 (or 223510577 counting only the distinct ones).

The product of its (nonzero) digits is 96000, while the sum is 36.

Adding to 2005551434421 its reverse (1244341555002), we get a palindrome (3249892989423).

The spelling of 2005551434421 in words is "two trillion, five billion, five hundred fifty-one million, four hundred thirty-four thousand, four hundred twenty-one".