21000201222011 has 4 divisors (see below), whose sum is σ = 22909310424024. Its totient is φ = 19091092020000.

The previous prime is 21000201221959. The next prime is 21000201222017. The reversal of 21000201222011 is 11022210200012.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-21000201222011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21000201222017) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 954554600990 + ... + 954554601011.

It is an arithmetic number, because the mean of its divisors is an integer number (5727327606006).

Almost surely, 2^{21000201222011} is an apocalyptic number.

21000201222011 is a deficient number, since it is larger than the sum of its proper divisors (1909109202013).

21000201222011 is a wasteful number, since it uses less digits than its factorization.

21000201222011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1909109202012.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21000201222011 its reverse (11022210200012), we get a palindrome (32022411422023).

It can be divided in two parts, 21000201 and 222011, that added together give a palindrome (21222212).

The spelling of 21000201222011 in words is "twenty-one trillion, two hundred one million, two hundred twenty-two thousand, eleven".