2152500121 has 4 divisors (see below), whose sum is σ = 2154759732. Its totient is φ = 2150240512.

The previous prime is 2152500109. The next prime is 2152500137. The reversal of 2152500121 is 1210052512.

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

It can be written as a sum of positive squares in 2 ways, for example, as 899340121 + 1253160000 = 29989^2 + 35400^2 .

It is a cyclic number.

It is not a de Polignac number, because 2152500121 - 2¹⁵ = 2152467353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2152500421) 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, 1128376 + ... + 1130281.

It is an arithmetic number, because the mean of its divisors is an integer number (538689933).

Almost surely, 2^2152500121 is an apocalyptic number.

It is an amenable number.

2152500121 is a deficient number, since it is larger than the sum of its proper divisors (2259611).

2152500121 is an equidigital number, since it uses as much as digits as its factorization.

2152500121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2259610.

The product of its (nonzero) digits is 200, while the sum is 19.

The square root of 2152500121 is about 46395.0441426668. The cubic root of 2152500121 is about 1291.1629680253.

Adding to 2152500121 its reverse (1210052512), we get a palindrome (3362552633).

The spelling of 2152500121 in words is "two billion, one hundred fifty-two million, five hundred thousand, one hundred twenty-one".