21001112211010 has 16 divisors (see below), whose sum is σ = 38042779065336. Its totient is φ = 8346938865408.

The previous prime is 21001112210993. The next prime is 21001112211083. The reversal of 21001112211010 is 1011221110012.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 15160736155041 + 5840376055969 = 3893679^2 + 2416687^2 .

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, 6688250727 + ... + 6688253866.

Almost surely, 2^{21001112211010} is an apocalyptic number.

21001112211010 is a deficient number, since it is larger than the sum of its proper divisors (17041666854326).

21001112211010 is a wasteful number, since it uses less digits than its factorization.

21001112211010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13376504757.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21001112211010 its reverse (1011221110012), we get a palindrome (22012333321022).

The spelling of 21001112211010 in words is "twenty-one trillion, one billion, one hundred twelve million, two hundred eleven thousand, ten".