21187720341152 has 48 divisors (see below), whose sum is σ = 46087355909952. Its totient is φ = 9537183575040.

The previous prime is 21187720341091. The next prime is 21187720341247. The reversal of 21187720341152 is 25114302778112.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 846683474 + ... + 846708497.

It is an arithmetic number, because the mean of its divisors is an integer number (960153248124).

Almost surely, 2^{21187720341152} is an apocalyptic number.

It is an amenable number.

21187720341152 is an abundant number, since it is smaller than the sum of its proper divisors (24899635568800).

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

21187720341152 is a wasteful number, since it uses less digits than its factorization.

21187720341152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1693392021 (or 1693392013 counting only the distinct ones).

The product of its (nonzero) digits is 188160, while the sum is 44.

The spelling of 21187720341152 in words is "twenty-one trillion, one hundred eighty-seven billion, seven hundred twenty million, three hundred forty-one thousand, one hundred fifty-two".