2121421234205 has 128 divisors (see below), whose sum is σ = 3480897079296. Its totient is φ = 1202157158400.

The previous prime is 2121421234169. The next prime is 2121421234217. The reversal of 2121421234205 is 5024321241212.

It is not a de Polignac number, because 2121421234205 - 2¹⁴ = 2121421217821 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 32167865 + ... + 32233745.

It is an arithmetic number, because the mean of its divisors is an integer number (27194508432).

Almost surely, 2^{2121421234205} is an apocalyptic number.

It is an amenable number.

2121421234205 is a deficient number, since it is larger than the sum of its proper divisors (1359475845091).

2121421234205 is a wasteful number, since it uses less digits than its factorization.

2121421234205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66127.

The product of its (nonzero) digits is 7680, while the sum is 29.

Adding to 2121421234205 its reverse (5024321241212), we get a palindrome (7145742475417).

The spelling of 2121421234205 in words is "two trillion, one hundred twenty-one billion, four hundred twenty-one million, two hundred thirty-four thousand, two hundred five".