2145521253 has 16 divisors (see below), whose sum is σ = 3003033600. Its totient is φ = 1360742640.

The previous prime is 2145521251. The next prime is 2145521281. The reversal of 2145521253 is 3521255412.

It is not a de Polignac number, because 2145521253 - 2¹ = 2145521251 is a prime.

It is a super-2 number, since 2×2145521253² = 9206522894149380018, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2145521253.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2145521251) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 190023 + ... + 200996.

It is an arithmetic number, because the mean of its divisors is an integer number (187689600).

Almost surely, 2^2145521253 is an apocalyptic number.

It is an amenable number.

2145521253 is a deficient number, since it is larger than the sum of its proper divisors (857512347).

2145521253 is a wasteful number, since it uses less digits than its factorization.

2145521253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 391112.

The product of its digits is 12000, while the sum is 30.

The square root of 2145521253 is about 46319.7717287121. The cubic root of 2145521253 is about 1289.7660479526.

Adding to 2145521253 its reverse (3521255412), we get a palindrome (5666776665).

The spelling of 2145521253 in words is "two billion, one hundred forty-five million, five hundred twenty-one thousand, two hundred fifty-three".