21010442330 has 16 divisors (see below), whose sum is σ = 37822662504. Its totient is φ = 8403317760.

The previous prime is 21010442329. The next prime is 21010442353. The reversal of 21010442330 is 3324401012.

It can be written as a sum of positive squares in 4 ways, for example, as 12241430881 + 8769011449 = 110641^2 + 93643^2 .

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, 470 + ... + 204990.

Almost surely, 2^21010442330 is an apocalyptic number.

21010442330 is a deficient number, since it is larger than the sum of its proper divisors (16812220174).

21010442330 is a wasteful number, since it uses less digits than its factorization.

21010442330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214801.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21010442330 its reverse (3324401012), we get a palindrome (24334843342).

The spelling of 21010442330 in words is "twenty-one billion, ten million, four hundred forty-two thousand, three hundred thirty".