211001001221011 has 4 divisors (see below), whose sum is σ = 211532489889472. Its totient is φ = 210469512552552.

The previous prime is 211001001220993. The next prime is 211001001221057. The reversal of 211001001221011 is 110122100100112.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211001001221011 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211001001220982 and 211001001221000.

It is not an unprimeable number, because it can be changed into a prime (211001004221011) 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, 265744333635 + ... + 265744334428.

It is an arithmetic number, because the mean of its divisors is an integer number (52883122472368).

Almost surely, 2^{211001001221011} is an apocalyptic number.

211001001221011 is a deficient number, since it is larger than the sum of its proper divisors (531488668461).

211001001221011 is an equidigital number, since it uses as much as digits as its factorization.

211001001221011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 531488668460.

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

Adding to 211001001221011 its reverse (110122100100112), we get a palindrome (321123101321123).

The spelling of 211001001221011 in words is "two hundred eleven trillion, one billion, one million, two hundred twenty-one thousand, eleven".