101221031111 has 4 divisors (see below), whose sum is σ = 102018047232. Its totient is φ = 100424014992.

The previous prime is 101221031101. The next prime is 101221031113. The reversal of 101221031111 is 111130122101.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-101221031111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101221031113) 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, 398507870 + ... + 398508123.

It is an arithmetic number, because the mean of its divisors is an integer number (25504511808).

Almost surely, 2^101221031111 is an apocalyptic number.

101221031111 is a deficient number, since it is larger than the sum of its proper divisors (797016121).

101221031111 is an equidigital number, since it uses as much as digits as its factorization.

101221031111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 797016120.

The product of its (nonzero) digits is 12, while the sum is 14.

Adding to 101221031111 its reverse (111130122101), we get a palindrome (212351153212).

The spelling of 101221031111 in words is "one hundred one billion, two hundred twenty-one million, thirty-one thousand, one hundred eleven".