55431452421 has 12 divisors (see below), whose sum is σ = 80074339020. Its totient is φ = 36951216000.

The previous prime is 55431452393. The next prime is 55431452429. The reversal of 55431452421 is 12425413455.

55431452421 is a `hidden beast` number, since 55 + 43 + 145 + 2 + 421 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 46932456321 + 8498996100 = 216639^2 + 92190^2 .

It is not a de Polignac number, because 55431452421 - 2⁹ = 55431451909 is a prime.

It is a super-2 number, since 2×55431452421² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55431452429) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 140580 + ... + 361421.

It is an arithmetic number, because the mean of its divisors is an integer number (6672861585).

Almost surely, 2^55431452421 is an apocalyptic number.

It is an amenable number.

55431452421 is a deficient number, since it is larger than the sum of its proper divisors (24642886599).

55431452421 is a wasteful number, since it uses less digits than its factorization.

55431452421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 514276 (or 514273 counting only the distinct ones).

The product of its digits is 96000, while the sum is 36.

Adding to 55431452421 its reverse (12425413455), we get a palindrome (67856865876).

The spelling of 55431452421 in words is "fifty-five billion, four hundred thirty-one million, four hundred fifty-two thousand, four hundred twenty-one".