213521531460 has 96 divisors (see below), whose sum is σ = 631667030400. Its totient is φ = 53741675520.

The previous prime is 213521531449. The next prime is 213521531467. The reversal of 213521531460 is 64135125312.

It is not an unprimeable number, because it can be changed into a prime (213521531467) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 41481 + ... + 654800.

It is an arithmetic number, because the mean of its divisors is an integer number (6579864900).

Almost surely, 2^213521531460 is an apocalyptic number.

213521531460 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 213521531460, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (315833515200).

213521531460 is an abundant number, since it is smaller than the sum of its proper divisors (418145498940).

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

213521531460 is a wasteful number, since it uses less digits than its factorization.

213521531460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 696581 (or 696579 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 33.

Adding to 213521531460 its reverse (64135125312), we get a palindrome (277656656772).

The spelling of 213521531460 in words is "two hundred thirteen billion, five hundred twenty-one million, five hundred thirty-one thousand, four hundred sixty".