213231521424 has 80 divisors (see below), whose sum is σ = 586473713280. Its totient is φ = 66526525440.

The previous prime is 213231521423. The next prime is 213231521443. The reversal of 213231521424 is 424125132312.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 213231521391 and 213231521400.

It is not an unprimeable number, because it can be changed into a prime (213231521423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 574164 + ... + 869555.

It is an arithmetic number, because the mean of its divisors is an integer number (7330921416).

Almost surely, 2^213231521424 is an apocalyptic number.

213231521424 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

213231521424 is an abundant number, since it is smaller than the sum of its proper divisors (373242191856).

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

213231521424 is a wasteful number, since it uses less digits than its factorization.

213231521424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1443928 (or 1443922 counting only the distinct ones).

The product of its digits is 11520, while the sum is 30.

Adding to 213231521424 its reverse (424125132312), we get a palindrome (637356653736).

The spelling of 213231521424 in words is "two hundred thirteen billion, two hundred thirty-one million, five hundred twenty-one thousand, four hundred twenty-four".