213243020442 has 24 divisors (see below), whose sum is σ = 479138639616. Its totient is φ = 71081006652.

The previous prime is 213243020401. The next prime is 213243020447. The reversal of 213243020442 is 244020342312.

213243020442 is a `hidden beast` number, since 21 + 3 + 2 + 430 + 204 + 4 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (213243020447) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 219385338 + ... + 219386309.

It is an arithmetic number, because the mean of its divisors is an integer number (19964109984).

Almost surely, 2^213243020442 is an apocalyptic number.

213243020442 is an abundant number, since it is smaller than the sum of its proper divisors (265895619174).

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

213243020442 is an equidigital number, since it uses as much as digits as its factorization.

213243020442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 438771664 (or 438771652 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 27.

Adding to 213243020442 its reverse (244020342312), we get a palindrome (457263362754).

The spelling of 213243020442 in words is "two hundred thirteen billion, two hundred forty-three million, twenty thousand, four hundred forty-two".