55231354543421 has 4 divisors (see below), whose sum is σ = 63121548049632. Its totient is φ = 47341161037212.

The previous prime is 55231354543373. The next prime is 55231354543439. The reversal of 55231354543421 is 12434545313255.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 55231354543421 - 2⁶ = 55231354543357 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55231354548421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3945096753095 + ... + 3945096753108.

It is an arithmetic number, because the mean of its divisors is an integer number (15780387012408).

Almost surely, 2^{55231354543421} is an apocalyptic number.

It is an amenable number.

55231354543421 is a deficient number, since it is larger than the sum of its proper divisors (7890193506211).

55231354543421 is an equidigital number, since it uses as much as digits as its factorization.

55231354543421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7890193506210.

The product of its digits is 4320000, while the sum is 47.

Adding to 55231354543421 its reverse (12434545313255), we get a palindrome (67665899856676).

The spelling of 55231354543421 in words is "fifty-five trillion, two hundred thirty-one billion, three hundred fifty-four million, five hundred forty-three thousand, four hundred twenty-one".