531400251221 has 16 divisors (see below), whose sum is σ = 617650790400. Its totient is φ = 447734835888.

The previous prime is 531400251191. The next prime is 531400251223. The reversal of 531400251221 is 122152004135.

It is not a de Polignac number, because 531400251221 - 2⁶ = 531400251157 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (531400251223) 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, 7457600 + ... + 7528518.

It is an arithmetic number, because the mean of its divisors is an integer number (38603174400).

Almost surely, 2^531400251221 is an apocalyptic number.

It is an amenable number.

531400251221 is a deficient number, since it is larger than the sum of its proper divisors (86250539179).

531400251221 is a wasteful number, since it uses less digits than its factorization.

531400251221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89128.

The product of its (nonzero) digits is 2400, while the sum is 26.

Adding to 531400251221 its reverse (122152004135), we get a palindrome (653552255356).

The spelling of 531400251221 in words is "five hundred thirty-one billion, four hundred million, two hundred fifty-one thousand, two hundred twenty-one".