55421443521401 has 4 divisors (see below), whose sum is σ = 55513966800000. Its totient is φ = 55328920242804.

The previous prime is 55421443521343. The next prime is 55421443521403. The reversal of 55421443521401 is 10412534412455.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55421443521401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55421443521403) 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, 46261638401 + ... + 46261639598.

It is an arithmetic number, because the mean of its divisors is an integer number (13878491700000).

Almost surely, 2^{55421443521401} is an apocalyptic number.

It is an amenable number.

55421443521401 is a deficient number, since it is larger than the sum of its proper divisors (92523278599).

55421443521401 is an equidigital number, since it uses as much as digits as its factorization.

55421443521401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92523278598.

The product of its (nonzero) digits is 384000, while the sum is 41.

Adding to 55421443521401 its reverse (10412534412455), we get a palindrome (65833977933856).

The spelling of 55421443521401 in words is "fifty-five trillion, four hundred twenty-one billion, four hundred forty-three million, five hundred twenty-one thousand, four hundred one".