101231220311 has 4 divisors (see below), whose sum is σ = 109018237272. Its totient is φ = 93444203352.

The previous prime is 101231220301. The next prime is 101231220341. The reversal of 101231220311 is 113022132101.

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-101231220311 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 101231220311.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101231220301) 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, 3893508461 + ... + 3893508486.

It is an arithmetic number, because the mean of its divisors is an integer number (27254559318).

Almost surely, 2^101231220311 is an apocalyptic number.

101231220311 is a deficient number, since it is larger than the sum of its proper divisors (7787016961).

101231220311 is an equidigital number, since it uses as much as digits as its factorization.

101231220311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7787016960.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 101231220311 its reverse (113022132101), we get a palindrome (214253352412).

The spelling of 101231220311 in words is "one hundred one billion, two hundred thirty-one million, two hundred twenty thousand, three hundred eleven".