213981788520 has 48 divisors (see below), whose sum is σ = 695440813860. Its totient is φ = 57061810176.

The previous prime is 213981788519. The next prime is 213981788563. The reversal of 213981788520 is 25887189312.

213981788520 is a `hidden beast` number, since 2 + 1 + 39 + 8 + 1 + 7 + 88 + 520 = 666.

213981788520 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 201050004996 + 12931783524 = 448386^2 + 113718^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 297196569 + ... + 297197288.

Almost surely, 2^213981788520 is an apocalyptic number.

213981788520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

213981788520 is an abundant number, since it is smaller than the sum of its proper divisors (481459025340).

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

213981788520 is a wasteful number, since it uses less digits than its factorization.

213981788520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 594393874 (or 594393867 counting only the distinct ones).

The product of its (nonzero) digits is 1935360, while the sum is 54.

The spelling of 213981788520 in words is "two hundred thirteen billion, nine hundred eighty-one million, seven hundred eighty-eight thousand, five hundred twenty".