55403431421 has 8 divisors (see below), whose sum is σ = 59670245880. Its totient is φ = 51137332992.

The previous prime is 55403431403. The next prime is 55403431423. The reversal of 55403431421 is 12413430455.

It can be written as a sum of positive squares in 4 ways, for example, as 1307184025 + 54096247396 = 36155^2 + 232586^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 55403431421 - 2³⁰ = 54329689597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55403431423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12560 + ... + 333113.

It is an arithmetic number, because the mean of its divisors is an integer number (7458780735).

Almost surely, 2^55403431421 is an apocalyptic number.

It is an amenable number.

55403431421 is a deficient number, since it is larger than the sum of its proper divisors (4266814459).

55403431421 is a wasteful number, since it uses less digits than its factorization.

55403431421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 358015.

The product of its (nonzero) digits is 28800, while the sum is 32.

Adding to 55403431421 its reverse (12413430455), we get a palindrome (67816861876).

The spelling of 55403431421 in words is "fifty-five billion, four hundred three million, four hundred thirty-one thousand, four hundred twenty-one".