21028210396140 has 48 divisors (see below), whose sum is σ = 58883484860928. Its totient is φ = 5607094605504.

The previous prime is 21028210396133. The next prime is 21028210396169. The reversal of 21028210396140 is 4169301282012.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12587482 + ... + 14159841.

It is an arithmetic number, because the mean of its divisors is an integer number (1226739267936).

Almost surely, 2^{21028210396140} is an apocalyptic number.

21028210396140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21028210396140 is an abundant number, since it is smaller than the sum of its proper divisors (37855274464788).

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

21028210396140 is a wasteful number, since it uses less digits than its factorization.

21028210396140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26760438 (or 26760436 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 39.

The spelling of 21028210396140 in words is "twenty-one trillion, twenty-eight billion, two hundred ten million, three hundred ninety-six thousand, one hundred forty".