21110019912870 has 64 divisors (see below), whose sum is σ = 58221668284416. Its totient is φ = 4798489127040.

The previous prime is 21110019912869. The next prime is 21110019912889. The reversal of 21110019912870 is 7821991001112.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 277652334 + ... + 277728353.

It is an arithmetic number, because the mean of its divisors is an integer number (909713566944).

Almost surely, 2^{21110019912870} is an apocalyptic number.

21110019912870 is an abundant number, since it is smaller than the sum of its proper divisors (37111648371546).

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

21110019912870 is a wasteful number, since it uses less digits than its factorization.

21110019912870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 555380885.

The product of its (nonzero) digits is 18144, while the sum is 42.

The spelling of 21110019912870 in words is "twenty-one trillion, one hundred ten billion, nineteen million, nine hundred twelve thousand, eight hundred seventy".