101220111211 has 4 divisors (see below), whose sum is σ = 101222184312. Its totient is φ = 101218038112.

The previous prime is 101220111193. The next prime is 101220111217. The reversal of 101220111211 is 112111022101.

It is a happy number.

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 101220111211 - 2¹¹ = 101220109163 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 101220111191 and 101220111200.

It is not an unprimeable number, because it can be changed into a prime (101220111217) 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, 961501 + ... + 1061566.

It is an arithmetic number, because the mean of its divisors is an integer number (25305546078).

Almost surely, 2^101220111211 is an apocalyptic number.

101220111211 is a deficient number, since it is larger than the sum of its proper divisors (2073101).

101220111211 is an equidigital number, since it uses as much as digits as its factorization.

101220111211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2073100.

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

Adding to 101220111211 its reverse (112111022101), we get a palindrome (213331133312).

The spelling of 101220111211 in words is "one hundred one billion, two hundred twenty million, one hundred eleven thousand, two hundred eleven".