2121569253 has 20 divisors (see below), whose sum is σ = 3209384640. Its totient is φ = 1396471752.

The previous prime is 2121569251. The next prime is 2121569257. The reversal of 2121569253 is 3529651212.

It is a happy number.

2121569253 is a `hidden beast` number, since 21 + 21 + 569 + 2 + 53 = 666.

It is not a de Polignac number, because 2121569253 - 2¹ = 2121569251 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121569251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 159375 + ... + 172172.

It is an arithmetic number, because the mean of its divisors is an integer number (160469232).

Almost surely, 2^2121569253 is an apocalyptic number.

It is an amenable number.

2121569253 is a deficient number, since it is larger than the sum of its proper divisors (1087815387).

2121569253 is an equidigital number, since it uses as much as digits as its factorization.

2121569253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 331638 (or 331629 counting only the distinct ones).

The product of its digits is 32400, while the sum is 36.

The square root of 2121569253 is about 46060.4955791837. The cubic root of 2121569253 is about 1284.9485468454.

The spelling of 2121569253 in words is "two billion, one hundred twenty-one million, five hundred sixty-nine thousand, two hundred fifty-three".