21003234442 has 8 divisors (see below), whose sum is σ = 31612377636. Its totient is φ = 10465775232.

The previous prime is 21003234419. The next prime is 21003234491. The reversal of 21003234442 is 24443230012.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 20929119561 + 74114881 = 144669^2 + 8609^2 .

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

It is a super-2 number, since 2×21003234442² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17920263 + ... + 17921434.

Almost surely, 2^21003234442 is an apocalyptic number.

21003234442 is a deficient number, since it is larger than the sum of its proper divisors (10609143194).

21003234442 is a wasteful number, since it uses less digits than its factorization.

21003234442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35841992.

The product of its (nonzero) digits is 4608, while the sum is 25.

Adding to 21003234442 its reverse (24443230012), we get a palindrome (45446464454).

The spelling of 21003234442 in words is "twenty-one billion, three million, two hundred thirty-four thousand, four hundred forty-two".