21011212330 has 16 divisors (see below), whose sum is σ = 37967347080. Its totient is φ = 8371781632.

The previous prime is 21011212297. The next prime is 21011212331. The reversal of 21011212330 is 3321211012.

It can be written as a sum of positive squares in 4 ways, for example, as 20030457841 + 980754489 = 141529^2 + 31317^2 .

It is not an unprimeable number, because it can be changed into a prime (21011212331) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4085215 + ... + 4090354.

Almost surely, 2^21011212330 is an apocalyptic number.

21011212330 is a deficient number, since it is larger than the sum of its proper divisors (16956134750).

21011212330 is a wasteful number, since it uses less digits than its factorization.

21011212330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8175833.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21011212330 its reverse (3321211012), we get a palindrome (24332423342).

The spelling of 21011212330 in words is "twenty-one billion, eleven million, two hundred twelve thousand, three hundred thirty".