252841211721 has 30 divisors (see below), whose sum is σ = 439366556970. Its totient is φ = 144480690144.

The previous prime is 252841211681. The next prime is 252841211773. The reversal of 252841211721 is 127112148252.

252841211721 is a `hidden beast` number, since 2 + 528 + 4 + 12 + 117 + 2 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 248646836025 + 4194375696 = 498645^2 + 64764^2 .

It is not a de Polignac number, because 252841211721 - 2¹⁹ = 252840687433 is a prime.

It is not an unprimeable number, because it can be changed into a prime (252841211221) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 31848036 + ... + 31855973.

It is an arithmetic number, because the mean of its divisors is an integer number (14645551899).

Almost surely, 2^252841211721 is an apocalyptic number.

252841211721 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

252841211721 is a deficient number, since it is larger than the sum of its proper divisors (186525345249).

252841211721 is an equidigital number, since it uses as much as digits as its factorization.

252841211721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63704035 (or 63704019 counting only the distinct ones).

The product of its digits is 17920, while the sum is 36.

Adding to 252841211721 its reverse (127112148252), we get a palindrome (379953359973).

The spelling of 252841211721 in words is "two hundred fifty-two billion, eight hundred forty-one million, two hundred eleven thousand, seven hundred twenty-one".