213908794440 has 128 divisors (see below), whose sum is σ = 700175145600. Its totient is φ = 51848529920.

The previous prime is 213908794427. The next prime is 213908794459. The reversal of 213908794440 is 44497809312.

213908794440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16584634 + ... + 16597526.

It is an arithmetic number, because the mean of its divisors is an integer number (5470118325).

Almost surely, 2^213908794440 is an apocalyptic number.

213908794440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

213908794440 is an abundant number, since it is smaller than the sum of its proper divisors (486266351160).

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

213908794440 is a wasteful number, since it uses less digits than its factorization.

213908794440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25487 (or 25483 counting only the distinct ones).

The product of its (nonzero) digits is 1741824, while the sum is 51.

The spelling of 213908794440 in words is "two hundred thirteen billion, nine hundred eight million, seven hundred ninety-four thousand, four hundred forty".