213144331640 has 32 divisors (see below), whose sum is σ = 486329326560. Its totient is φ = 84056918400.

The previous prime is 213144331591. The next prime is 213144331657. The reversal of 213144331640 is 46133441312.

It is a super-2 number, since 2×213144331640² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 213144331597 and 213144331606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37522571 + ... + 37528250.

It is an arithmetic number, because the mean of its divisors is an integer number (15197791455).

Almost surely, 2^213144331640 is an apocalyptic number.

213144331640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

213144331640 is an abundant number, since it is smaller than the sum of its proper divisors (273184994920).

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

213144331640 is a wasteful number, since it uses less digits than its factorization.

213144331640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75050903 (or 75050899 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 32.

Adding to 213144331640 its reverse (46133441312), we get a palindrome (259277772952).

The spelling of 213144331640 in words is "two hundred thirteen billion, one hundred forty-four million, three hundred thirty-one thousand, six hundred forty".