21001120211011 has 16 divisors (see below), whose sum is σ = 22665682922400. Its totient is φ = 19393341235200.

The previous prime is 21001120210991. The next prime is 21001120211077. The reversal of 21001120211011 is 11011202110012.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21001120211011 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21001120210982 and 21001120211000.

It is not an unprimeable number, because it can be changed into a prime (21001120251011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11059870 + ... + 12818851.

It is an arithmetic number, because the mean of its divisors is an integer number (1416605182650).

Almost surely, 2^{21001120211011} is an apocalyptic number.

21001120211011 is a deficient number, since it is larger than the sum of its proper divisors (1664562711389).

21001120211011 is a wasteful number, since it uses less digits than its factorization.

21001120211011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23879910.

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

Adding to 21001120211011 its reverse (11011202110012), we get a palindrome (32012322321023).

The spelling of 21001120211011 in words is "twenty-one trillion, one billion, one hundred twenty million, two hundred eleven thousand, eleven".