21112140442 has 32 divisors (see below), whose sum is σ = 32140195200. Its totient is φ = 10400322240.

The previous prime is 21112140403. The next prime is 21112140479. The reversal of 21112140442 is 24404121112.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27311568 + ... + 27312340.

It is an arithmetic number, because the mean of its divisors is an integer number (1004381100).

Almost surely, 2^21112140442 is an apocalyptic number.

21112140442 is a deficient number, since it is larger than the sum of its proper divisors (11028054758).

21112140442 is a wasteful number, since it uses less digits than its factorization.

21112140442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1558.

The product of its (nonzero) digits is 512, while the sum is 22.

Adding to 21112140442 its reverse (24404121112), we get a palindrome (45516261554).

The spelling of 21112140442 in words is "twenty-one billion, one hundred twelve million, one hundred forty thousand, four hundred forty-two".