2155717221150 has 96 divisors (see below), whose sum is σ = 5434667301888. Its totient is φ = 565420710400.

The previous prime is 2155717221131. The next prime is 2155717221173. The reversal of 2155717221150 is 511227175512.

It is a junction number, because it is equal to n+sod(n) for n = 2155717221099 and 2155717221108.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1735027 + ... + 2705873.

It is an arithmetic number, because the mean of its divisors is an integer number (56611117728).

Almost surely, 2^{2155717221150} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2155717221150, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2717333650944).

2155717221150 is an abundant number, since it is smaller than the sum of its proper divisors (3278950080738).

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

2155717221150 is a wasteful number, since it uses less digits than its factorization.

2155717221150 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 971106 (or 971101 counting only the distinct ones).

The product of its (nonzero) digits is 49000, while the sum is 39.

The spelling of 2155717221150 in words is "two trillion, one hundred fifty-five billion, seven hundred seventeen million, two hundred twenty-one thousand, one hundred fifty".