211220030011 has 4 divisors (see below), whose sum is σ = 211221162432. Its totient is φ = 211218897592.

The previous prime is 211220029991. The next prime is 211220030107. The reversal of 211220030011 is 110030022112.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 211220030011 - 2²⁷ = 211085812283 is a prime.

It is a super-2 number, since 2×211220030011² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211220029973 and 211220030000.

It is not an unprimeable number, because it can be changed into a prime (211220036011) 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, 212971 + ... + 683956.

It is an arithmetic number, because the mean of its divisors is an integer number (52805290608).

Almost surely, 2^211220030011 is an apocalyptic number.

211220030011 is a deficient number, since it is larger than the sum of its proper divisors (1132421).

211220030011 is an equidigital number, since it uses as much as digits as its factorization.

211220030011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1132420.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 211220030011 its reverse (110030022112), we get a palindrome (321250052123).

The spelling of 211220030011 in words is "two hundred eleven billion, two hundred twenty million, thirty thousand, eleven".