2121253563 has 32 divisors (see below), whose sum is σ = 3346801920. Its totient is φ = 1178144640.

The previous prime is 2121253559. The next prime is 2121253579. The reversal of 2121253563 is 3653521212.

It is not a de Polignac number, because 2121253563 - 2² = 2121253559 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2121253563.

It is not an unprimeable number, because it can be changed into a prime (2121253583) 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, 41845 + ... + 77417.

It is an arithmetic number, because the mean of its divisors is an integer number (104587560).

Almost surely, 2^2121253563 is an apocalyptic number.

2121253563 is a deficient number, since it is larger than the sum of its proper divisors (1225548357).

2121253563 is a wasteful number, since it uses less digits than its factorization.

2121253563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35739.

The product of its digits is 10800, while the sum is 30.

The square root of 2121253563 is about 46057.0685454470. The cubic root of 2121253563 is about 1284.8848101360.

Adding to 2121253563 its reverse (3653521212), we get a palindrome (5774774775).

The spelling of 2121253563 in words is "two billion, one hundred twenty-one million, two hundred fifty-three thousand, five hundred sixty-three".