213321243440 has 40 divisors (see below), whose sum is σ = 496113566640. Its totient is φ = 85304123136.

The previous prime is 213321243431. The next prime is 213321243449. The reversal of 213321243440 is 44342123312.

It is an interprime number because it is at equal distance from previous prime (213321243431) and next prime (213321243449).

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (213321243449) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 97730 + ... + 660449.

It is an arithmetic number, because the mean of its divisors is an integer number (12402839166).

Almost surely, 2^213321243440 is an apocalyptic number.

213321243440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

213321243440 is an abundant number, since it is smaller than the sum of its proper divisors (282792323200).

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

213321243440 is a wasteful number, since it uses less digits than its factorization.

213321243440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 761709 (or 761703 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 29.

Adding to 213321243440 its reverse (44342123312), we get a palindrome (257663366752).

The spelling of 213321243440 in words is "two hundred thirteen billion, three hundred twenty-one million, two hundred forty-three thousand, four hundred forty".