21887128972410 has 96 divisors (see below), whose sum is σ = 56972830576320. Its totient is φ = 5378868278784.

The previous prime is 21887128972409. The next prime is 21887128972421. The reversal of 21887128972410 is 1427982178812.

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, 370180 + ... + 6626559.

It is an arithmetic number, because the mean of its divisors is an integer number (593466985170).

Almost surely, 2^{21887128972410} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21887128972410, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28486415288160).

21887128972410 is an abundant number, since it is smaller than the sum of its proper divisors (35085701603910).

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

21887128972410 is a wasteful number, since it uses less digits than its factorization.

21887128972410 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6997392 (or 6997379 counting only the distinct ones).

The product of its (nonzero) digits is 7225344, while the sum is 60.

The spelling of 21887128972410 in words is "twenty-one trillion, eight hundred eighty-seven billion, one hundred twenty-eight million, nine hundred seventy-two thousand, four hundred ten".