2126121661355 has 16 divisors (see below), whose sum is σ = 2568568860000. Its totient is φ = 1689416305920.

The previous prime is 2126121661303. The next prime is 2126121661379. The reversal of 2126121661355 is 5531661216212.

It is not a de Polignac number, because 2126121661355 - 2⁶ = 2126121661291 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30285695 + ... + 30355815.

It is an arithmetic number, because the mean of its divisors is an integer number (160535553750).

Almost surely, 2^{2126121661355} is an apocalyptic number.

2126121661355 is a deficient number, since it is larger than the sum of its proper divisors (442447198645).

2126121661355 is a wasteful number, since it uses less digits than its factorization.

2126121661355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110974.

The product of its digits is 129600, while the sum is 41.

Adding to 2126121661355 its reverse (5531661216212), we get a palindrome (7657782877567).

The spelling of 2126121661355 in words is "two trillion, one hundred twenty-six billion, one hundred twenty-one million, six hundred sixty-one thousand, three hundred fifty-five".