21034002442 has 16 divisors (see below), whose sum is σ = 32038138440. Its totient is φ = 10355724288.

The previous prime is 21034002439. The next prime is 21034002559. The reversal of 21034002442 is 24420043012.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 20859736041 + 174266401 = 144429^2 + 13201^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 236967 + ... + 313402.

Almost surely, 2^21034002442 is an apocalyptic number.

21034002442 is a deficient number, since it is larger than the sum of its proper divisors (11004135998).

21034002442 is a wasteful number, since it uses less digits than its factorization.

21034002442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 550665.

The product of its (nonzero) digits is 1536, while the sum is 22.

Adding to 21034002442 its reverse (24420043012), we get a palindrome (45454045454).

The spelling of 21034002442 in words is "twenty-one billion, thirty-four million, two thousand, four hundred forty-two".