101221310221 has 4 divisors (see below), whose sum is σ = 101289291100. Its totient is φ = 101153329344.

The previous prime is 101221310107. The next prime is 101221310231. The reversal of 101221310221 is 122013122101.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122013122101 = 13 ⋅9385624777.

It can be written as a sum of positive squares in 2 ways, for example, as 14758848196 + 86462462025 = 121486^2 + 294045^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-101221310221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 101221310195 and 101221310204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101221310231) 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, 33988206 + ... + 33991183.

It is an arithmetic number, because the mean of its divisors is an integer number (25322322775).

Almost surely, 2^101221310221 is an apocalyptic number.

It is an amenable number.

101221310221 is a deficient number, since it is larger than the sum of its proper divisors (67980879).

101221310221 is an equidigital number, since it uses as much as digits as its factorization.

101221310221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67980878.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 101221310221 its reverse (122013122101), we get a palindrome (223234432322).

The spelling of 101221310221 in words is "one hundred one billion, two hundred twenty-one million, three hundred ten thousand, two hundred twenty-one".