2121355561363 has 4 divisors (see below), whose sum is σ = 2121382090080. Its totient is φ = 2121329032648.

The previous prime is 2121355561349. The next prime is 2121355561373. The reversal of 2121355561363 is 3631655531212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2121355561363 - 2³⁷ = 1983916607891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2121355561333) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13144048 + ... + 13304461.

It is an arithmetic number, because the mean of its divisors is an integer number (530345522520).

Almost surely, 2^{2121355561363} is an apocalyptic number.

2121355561363 is a deficient number, since it is larger than the sum of its proper divisors (26528717).

2121355561363 is an equidigital number, since it uses as much as digits as its factorization.

2121355561363 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26528716.

The product of its digits is 486000, while the sum is 43.

The spelling of 2121355561363 in words is "two trillion, one hundred twenty-one billion, three hundred fifty-five million, five hundred sixty-one thousand, three hundred sixty-three".