2121505520550 has 96 divisors (see below), whose sum is σ = 5669974931712. Its totient is φ = 521855153280.

The previous prime is 2121505520549. The next prime is 2121505520551. The reversal of 2121505520550 is 550255051212.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2121505520549) and next prime (2121505520551).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121505520551) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2445717 + ... + 3197583.

It is an arithmetic number, because the mean of its divisors is an integer number (59062238872).

Almost surely, 2^{2121505520550} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2121505520550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2834987465856).

2121505520550 is an abundant number, since it is smaller than the sum of its proper divisors (3548469411162).

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

2121505520550 is a wasteful number, since it uses less digits than its factorization.

2121505520550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 753342 (or 753337 counting only the distinct ones).

The product of its (nonzero) digits is 25000, while the sum is 33.

The spelling of 2121505520550 in words is "two trillion, one hundred twenty-one billion, five hundred five million, five hundred twenty thousand, five hundred fifty".