21111000002 has 16 divisors (see below), whose sum is σ = 31996034424. Its totient is φ = 10445760000.

The previous prime is 21110999977. The next prime is 21111000007. The reversal of 21111000002 is 20000011112.

It can be written as a sum of positive squares in 4 ways, for example, as 18493552081 + 2617447921 = 135991^2 + 51161^2 .

It is not an unprimeable number, because it can be changed into a prime (21111000007) 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, 395252 + ... + 445472.

Almost surely, 2^21111000002 is an apocalyptic number.

21111000002 is a deficient number, since it is larger than the sum of its proper divisors (10885034422).

21111000002 is a wasteful number, since it uses less digits than its factorization.

21111000002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52405.

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 21111000002 its reverse (20000011112), we get a palindrome (41111011114).

The spelling of 21111000002 in words is "twenty-one billion, one hundred eleven million, two", and thus it is an aban number.