21121110002 has 16 divisors (see below), whose sum is σ = 33223103640. Its totient is φ = 10056719232.

The previous prime is 21121109923. The next prime is 21121110037. The reversal of 21121110002 is 20001112112.

It can be written as a sum of positive squares in 4 ways, for example, as 17168598841 + 3952511161 = 131029^2 + 62869^2 .

It is a super-2 number, since 2×21121110002² (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 7 ways as a sum of consecutive naturals, for example, 2489993 + ... + 2498460.

Almost surely, 2^21121110002 is an apocalyptic number.

21121110002 is a deficient number, since it is larger than the sum of its proper divisors (12101993638).

21121110002 is a wasteful number, since it uses less digits than its factorization.

21121110002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4988557.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21121110002 its reverse (20001112112), we get a palindrome (41122222114).

The spelling of 21121110002 in words is "twenty-one billion, one hundred twenty-one million, one hundred ten thousand, two".