2151201305550 has 96 divisors (see below), whose sum is σ = 5822442589824. Its totient is φ = 521282448000.

The previous prime is 2151201305549. The next prime is 2151201305551. The reversal of 2151201305550 is 555031021512.

It is an interprime number because it is at equal distance from previous prime (2151201305549) and next prime (2151201305551).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2151201305551) 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, 3637212 + ... + 4187088.

It is an arithmetic number, because the mean of its divisors is an integer number (60650443644).

Almost surely, 2^{2151201305550} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2151201305550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2911221294912).

2151201305550 is an abundant number, since it is smaller than the sum of its proper divisors (3671241284274).

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

2151201305550 is a wasteful number, since it uses less digits than its factorization.

2151201305550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 552274 (or 552269 counting only the distinct ones).

The product of its (nonzero) digits is 7500, while the sum is 30.

The spelling of 2151201305550 in words is "two trillion, one hundred fifty-one billion, two hundred one million, three hundred five thousand, five hundred fifty".