2171861025480 has 320 divisors, whose sum is σ = 7550502220800. Its totient is φ = 559352977920.

The previous prime is 2171861025479. The next prime is 2171861025493. The reversal of 2171861025480 is 845201681712.

2171861025480 is a `hidden beast` number, since 2 + 1 + 7 + 1 + 8 + 610 + 25 + 4 + 8 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 50499826 + ... + 50542814.

It is an arithmetic number, because the mean of its divisors is an integer number (23595319440).

Almost surely, 2^{2171861025480} is an apocalyptic number.

2171861025480 is a gapful number since it is divisible by the number (20) 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 2171861025480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3775251110400).

2171861025480 is an abundant number, since it is smaller than the sum of its proper divisors (5378641195320).

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

2171861025480 is a wasteful number, since it uses less digits than its factorization.

2171861025480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43546 (or 43533 counting only the distinct ones).

The product of its (nonzero) digits is 215040, while the sum is 45.

The spelling of 2171861025480 in words is "two trillion, one hundred seventy-one billion, eight hundred sixty-one million, twenty-five thousand, four hundred eighty".