211221002220011 has 4 divisors (see below), whose sum is σ = 241395431108592. Its totient is φ = 181046573331432.

The previous prime is 211221002219989. The next prime is 211221002220013. The reversal of 211221002220011 is 110022200122112.

211221002220011 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 a cyclic number.

It is not a de Polignac number, because 211221002220011 - 2⁶ = 211221002219947 is a prime.

It is a super-2 number, since 2×211221002220011² (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 (211221002220013) 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, 15087214444280 + ... + 15087214444293.

It is an arithmetic number, because the mean of its divisors is an integer number (60348857777148).

Almost surely, 2^{211221002220011} is an apocalyptic number.

211221002220011 is a deficient number, since it is larger than the sum of its proper divisors (30174428888581).

211221002220011 is an equidigital number, since it uses as much as digits as its factorization.

211221002220011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30174428888580.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 211221002220011 its reverse (110022200122112), we get a palindrome (321243202342123).

The spelling of 211221002220011 in words is "two hundred eleven trillion, two hundred twenty-one billion, two million, two hundred twenty thousand, eleven".