213531340240 has 40 divisors (see below), whose sum is σ = 496592858880. Its totient is φ = 85389741696.

The previous prime is 213531340237. The next prime is 213531340259. The reversal of 213531340240 is 42043135312.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 213531340199 and 213531340208.

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, 52920 + ... + 655639.

It is an arithmetic number, because the mean of its divisors is an integer number (12414821472).

Almost surely, 2^213531340240 is an apocalyptic number.

213531340240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

213531340240 is an abundant number, since it is smaller than the sum of its proper divisors (283061518640).

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

213531340240 is a wasteful number, since it uses less digits than its factorization.

213531340240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 712339 (or 712333 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 28.

Adding to 213531340240 its reverse (42043135312), we get a palindrome (255574475552).

The spelling of 213531340240 in words is "two hundred thirteen billion, five hundred thirty-one million, three hundred forty thousand, two hundred forty".