2121051311455 has 48 divisors (see below), whose sum is σ = 2698194667680. Its totient is φ = 1598740088064.

The previous prime is 2121051311453. The next prime is 2121051311461. The reversal of 2121051311455 is 5541131501212.

It is not a de Polignac number, because 2121051311455 - 2¹ = 2121051311453 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121051311453) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 350410209 + ... + 350416261.

It is an arithmetic number, because the mean of its divisors is an integer number (56212388910).

Almost surely, 2^{2121051311455} is an apocalyptic number.

2121051311455 is a deficient number, since it is larger than the sum of its proper divisors (577143356225).

2121051311455 is a wasteful number, since it uses less digits than its factorization.

2121051311455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7480 (or 7437 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 31.

Adding to 2121051311455 its reverse (5541131501212), we get a palindrome (7662182812667).

The spelling of 2121051311455 in words is "two trillion, one hundred twenty-one billion, fifty-one million, three hundred eleven thousand, four hundred fifty-five".