101221011111 has 48 divisors (see below), whose sum is σ = 152174816640. Its totient is φ = 59349870720.

The previous prime is 101221011077. The next prime is 101221011131. The reversal of 101221011111 is 111110122101.

It is not a de Polignac number, because 101221011111 - 2¹¹ = 101221009063 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101221011131) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8080425 + ... + 8092941.

It is an arithmetic number, because the mean of its divisors is an integer number (3170308680).

Almost surely, 2^101221011111 is an apocalyptic number.

101221011111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

101221011111 is a deficient number, since it is larger than the sum of its proper divisors (50953805529).

101221011111 is a wasteful number, since it uses less digits than its factorization.

101221011111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12784 (or 12747 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 101221011111 its reverse (111110122101), we get a palindrome (212331133212).

It can be divided in two parts, 10122101 and 1111, that multiplied together give a palindrome (11245654211).

The spelling of 101221011111 in words is "one hundred one billion, two hundred twenty-one million, eleven thousand, one hundred eleven".