213440234640 has 320 divisors, whose sum is σ = 749565239040. Its totient is φ = 49916805120.

The previous prime is 213440234603. The next prime is 213440234671. The reversal of 213440234640 is 46432044312.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4706152 + ... + 4751288.

It is an arithmetic number, because the mean of its divisors is an integer number (2342391372).

Almost surely, 2^213440234640 is an apocalyptic number.

213440234640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 213440234640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (374782619520).

213440234640 is an abundant number, since it is smaller than the sum of its proper divisors (536125004400).

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

213440234640 is a wasteful number, since it uses less digits than its factorization.

213440234640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45250 (or 45244 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 33.

Adding to 213440234640 its reverse (46432044312), we get a palindrome (259872278952).

The spelling of 213440234640 in words is "two hundred thirteen billion, four hundred forty million, two hundred thirty-four thousand, six hundred forty".