2187865537220 has 24 divisors (see below), whose sum is σ = 5012201049408. Its totient is φ = 795587468000.

The previous prime is 2187865537199. The next prime is 2187865537223. The reversal of 2187865537220 is 227355687812.

It is not an unprimeable number, because it can be changed into a prime (2187865537223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4972421456 + ... + 4972421895.

It is an arithmetic number, because the mean of its divisors is an integer number (208841710392).

Almost surely, 2^{2187865537220} is an apocalyptic number.

2187865537220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2187865537220 is an abundant number, since it is smaller than the sum of its proper divisors (2824335512188).

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

2187865537220 is a wasteful number, since it uses less digits than its factorization.

2187865537220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9944843371 (or 9944843369 counting only the distinct ones).

The product of its (nonzero) digits is 11289600, while the sum is 56.

The spelling of 2187865537220 in words is "two trillion, one hundred eighty-seven billion, eight hundred sixty-five million, five hundred thirty-seven thousand, two hundred twenty".