21142132042 has 8 divisors (see below), whose sum is σ = 33578680356. Its totient is φ = 9949238592.

The previous prime is 21142132009. The next prime is 21142132043. The reversal of 21142132042 is 24023124112.

It can be written as a sum of positive squares in 2 ways, for example, as 16821830601 + 4320301441 = 129699^2 + 65729^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21142132043) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 310913673 + ... + 310913740.

Almost surely, 2^21142132042 is an apocalyptic number.

21142132042 is a deficient number, since it is larger than the sum of its proper divisors (12436548314).

21142132042 is a wasteful number, since it uses less digits than its factorization.

21142132042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 621827432.

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

Adding to 21142132042 its reverse (24023124112), we get a palindrome (45165256154).

The spelling of 21142132042 in words is "twenty-one billion, one hundred forty-two million, one hundred thirty-two thousand, forty-two".