21204131242 has 8 divisors (see below), whose sum is σ = 36349939296. Its totient is φ = 9087484812.

The previous prime is 21204131237. The next prime is 21204131269. The reversal of 21204131242 is 24213140212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 757290388 + ... + 757290415.

It is an arithmetic number, because the mean of its divisors is an integer number (4543742412).

Almost surely, 2^21204131242 is an apocalyptic number.

21204131242 is a deficient number, since it is larger than the sum of its proper divisors (15145808054).

21204131242 is a wasteful number, since it uses less digits than its factorization.

21204131242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1514580812.

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 21204131242 its reverse (24213140212), we get a palindrome (45417271454).

The spelling of 21204131242 in words is "twenty-one billion, two hundred four million, one hundred thirty-one thousand, two hundred forty-two".