21140402242 has 8 divisors (see below), whose sum is σ = 32308916796. Its totient is φ = 10370763312.

The previous prime is 21140402237. The next prime is 21140402263. The reversal of 21140402242 is 24220404112.

It can be written as a sum of positive squares in 2 ways, for example, as 21103082361 + 37319881 = 145269^2 + 6109^2 .

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 (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99718773 + ... + 99718984.

Almost surely, 2^21140402242 is an apocalyptic number.

21140402242 is a deficient number, since it is larger than the sum of its proper divisors (11168514554).

21140402242 is a wasteful number, since it uses less digits than its factorization.

21140402242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199437812.

The product of its (nonzero) digits is 1024, while the sum is 22.

Adding to 21140402242 its reverse (24220404112), we get a palindrome (45360806354).

The spelling of 21140402242 in words is "twenty-one billion, one hundred forty million, four hundred two thousand, two hundred forty-two".