55421043252520 has 64 divisors (see below), whose sum is σ = 137380335949440. Its totient is φ = 19953570912000.

The previous prime is 55421043252331. The next prime is 55421043252539. The reversal of 55421043252520 is 2525234012455.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 623504652 + ... + 623593531.

It is an arithmetic number, because the mean of its divisors is an integer number (2146567749210).

Almost surely, 2^{55421043252520} is an apocalyptic number.

It is an amenable number.

55421043252520 is an abundant number, since it is smaller than the sum of its proper divisors (81959292696920).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55421043252520 is a wasteful number, since it uses less digits than its factorization.

55421043252520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1247098306 (or 1247098302 counting only the distinct ones).

The product of its (nonzero) digits is 480000, while the sum is 40.

Adding to 55421043252520 its reverse (2525234012455), we get a palindrome (57946277264975).

The spelling of 55421043252520 in words is "fifty-five trillion, four hundred twenty-one billion, forty-three million, two hundred fifty-two thousand, five hundred twenty".