21142440323042 has 4 divisors (see below), whose sum is σ = 31713660484566. Its totient is φ = 10571220161520.

The previous prime is 21142440322931. The next prime is 21142440323089. The reversal of 21142440323042 is 24032304424112.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 14251085553721 + 6891354769321 = 3775061^2 + 2625139^2 .

It is a super-2 number, since 2×21142440323042² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5285610080759 + ... + 5285610080762.

Almost surely, 2^{21142440323042} is an apocalyptic number.

21142440323042 is a deficient number, since it is larger than the sum of its proper divisors (10571220161524).

21142440323042 is a wasteful number, since it uses less digits than its factorization.

21142440323042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10571220161523.

The product of its (nonzero) digits is 36864, while the sum is 32.

Adding to 21142440323042 its reverse (24032304424112), we get a palindrome (45174744747154).

The spelling of 21142440323042 in words is "twenty-one trillion, one hundred forty-two billion, four hundred forty million, three hundred twenty-three thousand, forty-two".