55021402400000 has 216 divisors, whose sum is σ = 137317550723640. Its totient is φ = 22001909760000.

The previous prime is 55021402399993. The next prime is 55021402400021. The reversal of 55021402400000 is 420412055.

It is a happy number.

It can be written as a sum of positive squares in 12 ways, for example, as 45613490258176 + 9407912141824 = 6753776^2 + 3067232^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3303191672 + ... + 3303208328.

Almost surely, 2^{55021402400000} is an apocalyptic number.

55021402400000 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55021402400000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68658775361820).

55021402400000 is an abundant number, since it is smaller than the sum of its proper divisors (82296148323640).

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

55021402400000 is an frugal number, since it uses more digits than its factorization.

55021402400000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20827 (or 20793 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 23.

Adding to 55021402400000 its reverse (420412055), we get a palindrome (55021822812055).

The spelling of 55021402400000 in words is "fifty-five trillion, twenty-one billion, four hundred two million, four hundred thousand".