2121617355 has 32 divisors (see below), whose sum is σ = 3988051200. Its totient is φ = 949534080.

The previous prime is 2121617353. The next prime is 2121617371. The reversal of 2121617355 is 5537161212.

It is not a de Polignac number, because 2121617355 - 2¹ = 2121617353 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (2121617353) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 492405 + ... + 496694.

It is an arithmetic number, because the mean of its divisors is an integer number (124626600).

Almost surely, 2^2121617355 is an apocalyptic number.

2121617355 is a deficient number, since it is larger than the sum of its proper divisors (1866433845).

2121617355 is a wasteful number, since it uses less digits than its factorization.

2121617355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 989131.

The product of its digits is 12600, while the sum is 33.

The square root of 2121617355 is about 46061.0177373449. The cubic root of 2121617355 is about 1284.9582579162.

Adding to 2121617355 its reverse (5537161212), we get a palindrome (7658778567).

The spelling of 2121617355 in words is "two billion, one hundred twenty-one million, six hundred seventeen thousand, three hundred fifty-five".