21016100848778 has 40 divisors (see below), whose sum is σ = 36782442320580. Its totient is φ = 9005319677760.

The previous prime is 21016100848751. The next prime is 21016100848811. The reversal of 21016100848778 is 87784800161012.

It can be written as a sum of positive squares in 2 ways, for example, as 20924193044209 + 91907804569 = 4574297^2 + 303163^2 .

It is a super-3 number, since 3×21016100848778³ (a number of 41 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 27187118 + ... + 27949446.

Almost surely, 2^{21016100848778} is an apocalyptic number.

21016100848778 is a deficient number, since it is larger than the sum of its proper divisors (15766341471802).

21016100848778 is an frugal number, since it uses more digits than its factorization.

21016100848778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 768100 (or 768079 counting only the distinct ones).

The product of its (nonzero) digits is 1204224, while the sum is 53.

The spelling of 21016100848778 in words is "twenty-one trillion, sixteen billion, one hundred million, eight hundred forty-eight thousand, seven hundred seventy-eight".