211221211222011 has 4 divisors (see below), whose sum is σ = 281628281629352. Its totient is φ = 140814140814672.

The previous prime is 211221211222009. The next prime is 211221211222057. The reversal of 211221211222011 is 110222112122112.

211221211222011 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 211221211222011 - 2¹ = 211221211222009 is a prime.

It is a super-2 number, since 2×211221211222011² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211221211222061) 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, 35203535203666 + ... + 35203535203671.

It is an arithmetic number, because the mean of its divisors is an integer number (70407070407338).

Almost surely, 2^{211221211222011} is an apocalyptic number.

211221211222011 is a deficient number, since it is larger than the sum of its proper divisors (70407070407341).

211221211222011 is an equidigital number, since it uses as much as digits as its factorization.

211221211222011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70407070407340.

The product of its (nonzero) digits is 128, while the sum is 21.

Adding to 211221211222011 its reverse (110222112122112), we get a palindrome (321443323344123).

The spelling of 211221211222011 in words is "two hundred eleven trillion, two hundred twenty-one billion, two hundred eleven million, two hundred twenty-two thousand, eleven".