252144451221 has 128 divisors (see below), whose sum is σ = 402531655680. Its totient is φ = 139053100032.

The previous prime is 252144451147. The next prime is 252144451277. The reversal of 252144451221 is 122154441252.

It is not a de Polignac number, because 252144451221 - 2¹¹ = 252144449173 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (252144451421) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 193510056 + ... + 193511358.

It is an arithmetic number, because the mean of its divisors is an integer number (3144778560).

Almost surely, 2^252144451221 is an apocalyptic number.

It is an amenable number.

252144451221 is a deficient number, since it is larger than the sum of its proper divisors (150387204459).

252144451221 is a wasteful number, since it uses less digits than its factorization.

252144451221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1587.

The product of its digits is 25600, while the sum is 33.

Adding to 252144451221 its reverse (122154441252), we get a palindrome (374298892473).

The spelling of 252144451221 in words is "two hundred fifty-two billion, one hundred forty-four million, four hundred fifty-one thousand, two hundred twenty-one".