2005210421355 has 16 divisors (see below), whose sum is σ = 3208375157760. Its totient is φ = 1069432730208.

The previous prime is 2005210421353. The next prime is 2005210421399. The reversal of 2005210421355 is 5531240125002.

It is not a de Polignac number, because 2005210421355 - 2¹ = 2005210421353 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2005210421353) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 565716 + ... + 2080974.

It is an arithmetic number, because the mean of its divisors is an integer number (200523447360).

Almost surely, 2^{2005210421355} is an apocalyptic number.

2005210421355 is a deficient number, since it is larger than the sum of its proper divisors (1203164736405).

2005210421355 is a wasteful number, since it uses less digits than its factorization.

2005210421355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1603490.

The product of its (nonzero) digits is 12000, while the sum is 30.

Adding to 2005210421355 its reverse (5531240125002), we get a palindrome (7536450546357).

The spelling of 2005210421355 in words is "two trillion, five billion, two hundred ten million, four hundred twenty-one thousand, three hundred fifty-five".