55244432421 has 12 divisors (see below), whose sum is σ = 81743794860. Its totient is φ = 35931337920.

The previous prime is 55244432401. The next prime is 55244432423. The reversal of 55244432421 is 12423444255.

55244432421 is a `hidden beast` number, since 552 + 44 + 43 + 2 + 4 + 21 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 3034467396 + 52209965025 = 55086^2 + 228495^2 .

It is not a de Polignac number, because 55244432421 - 2¹³ = 55244424229 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55244432423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 74856586 + ... + 74857323.

It is an arithmetic number, because the mean of its divisors is an integer number (6811982905).

Almost surely, 2^55244432421 is an apocalyptic number.

It is an amenable number.

55244432421 is a deficient number, since it is larger than the sum of its proper divisors (26499362439).

55244432421 is a wasteful number, since it uses less digits than its factorization.

55244432421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149713956 (or 149713953 counting only the distinct ones).

The product of its digits is 153600, while the sum is 36.

Adding to 55244432421 its reverse (12423444255), we get a palindrome (67667876676).

The spelling of 55244432421 in words is "fifty-five billion, two hundred forty-four million, four hundred thirty-two thousand, four hundred twenty-one".