101220311 has 4 divisors (see below), whose sum is σ = 101475672. Its totient is φ = 100964952.

The previous prime is 101220307. The next prime is 101220313. The reversal of 101220311 is 113022101.

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 101220311 - 2² = 101220307 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 101220292 and 101220301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101220313) 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, 127085 + ... + 127878.

It is an arithmetic number, because the mean of its divisors is an integer number (25368918).

Almost surely, 2^101220311 is an apocalyptic number.

101220311 is a deficient number, since it is larger than the sum of its proper divisors (255361).

101220311 is an equidigital number, since it uses as much as digits as its factorization.

101220311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255360.

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 101220311 is about 10060.8305323169. The cubic root of 101220311 is about 466.0393155750.

Adding to 101220311 its reverse (113022101), we get a palindrome (214242412).

The spelling of 101220311 in words is "one hundred one million, two hundred twenty thousand, three hundred eleven".