21100001330 has 32 divisors (see below), whose sum is σ = 38161885104. Its totient is φ = 8399655936.

The previous prime is 21100001323. The next prime is 21100001357. The reversal of 21100001330 is 3310000112.

It can be written as a sum of positive squares in 8 ways, for example, as 1311671089 + 19788330241 = 36217^2 + 140671^2 .

It is a super-2 number, since 2×21100001330² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2635814 + ... + 2643806.

Almost surely, 2^21100001330 is an apocalyptic number.

21100001330 is a deficient number, since it is larger than the sum of its proper divisors (17061883774).

21100001330 is a wasteful number, since it uses less digits than its factorization.

21100001330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9230.

The product of its (nonzero) digits is 18, while the sum is 11.

Adding to 21100001330 its reverse (3310000112), we get a palindrome (24410001442).

The spelling of 21100001330 in words is "twenty-one billion, one hundred million, one thousand, three hundred thirty".