21142144033 has 4 divisors (see below), whose sum is σ = 21149192068. Its totient is φ = 21135096000.

The previous prime is 21142144007. The next prime is 21142144069. The reversal of 21142144033 is 33044124112.

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

It can be written as a sum of positive squares in 2 ways, for example, as 6967574784 + 14174569249 = 83472^2 + 119057^2 .

It is a cyclic number.

It is not a de Polignac number, because 21142144033 - 2⁹ = 21142143521 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21142143989 and 21142144007.

It is not an unprimeable number, because it can be changed into a prime (21142244033) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3519516 + ... + 3525517.

It is an arithmetic number, because the mean of its divisors is an integer number (5287298017).

Almost surely, 2^21142144033 is an apocalyptic number.

It is an amenable number.

21142144033 is a deficient number, since it is larger than the sum of its proper divisors (7048035).

21142144033 is an equidigital number, since it uses as much as digits as its factorization.

21142144033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7048034.

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 21142144033 its reverse (33044124112), we get a palindrome (54186268145).

The spelling of 21142144033 in words is "twenty-one billion, one hundred forty-two million, one hundred forty-four thousand, thirty-three".