21000122330 has 24 divisors (see below), whose sum is σ = 41549004756. Its totient is φ = 7636407680.

The previous prime is 21000122327. The next prime is 21000122411. The reversal of 21000122330 is 3322100012.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 17287779289 + 3712343041 = 131483^2 + 60929^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8676527 + ... + 8678946.

Almost surely, 2^21000122330 is an apocalyptic number.

21000122330 is a deficient number, since it is larger than the sum of its proper divisors (20548882426).

21000122330 is a wasteful number, since it uses less digits than its factorization.

21000122330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17355502 (or 17355491 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

Adding to 21000122330 its reverse (3322100012), we get a palindrome (24322222342).

The spelling of 21000122330 in words is "twenty-one billion, one hundred twenty-two thousand, three hundred thirty".