21130030242 has 24 divisors (see below), whose sum is σ = 45877328640. Its totient is φ = 7028636280.

The previous prime is 21130030213. The next prime is 21130030247. The reversal of 21130030242 is 24203003112.

21130030242 is a `hidden beast` number, since 21 + 1 + 300 + 302 + 42 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (21130030247) 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, 1216734 + ... + 1233977.

It is an arithmetic number, because the mean of its divisors is an integer number (1911555360).

Almost surely, 2^21130030242 is an apocalyptic number.

21130030242 is an abundant number, since it is smaller than the sum of its proper divisors (24747298398).

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

21130030242 is a wasteful number, since it uses less digits than its factorization.

21130030242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2451198 (or 2451195 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 21130030242 its reverse (24203003112), we get a palindrome (45333033354).

The spelling of 21130030242 in words is "twenty-one billion, one hundred thirty million, thirty thousand, two hundred forty-two".