101012221 has 4 divisors (see below), whose sum is σ = 102012444. Its totient is φ = 100012000.

The previous prime is 101012207. The next prime is 101012231. The reversal of 101012221 is 122210101.

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

It can be written as a sum of positive squares in 2 ways, for example, as 99780121 + 1232100 = 9989^2 + 1110^2 .

It is a cyclic number.

It is not a de Polignac number, because 101012221 - 2⁹ = 101011709 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 101012198 and 101012207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101012231) 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, 499960 + ... + 500161.

It is an arithmetic number, because the mean of its divisors is an integer number (25503111).

Almost surely, 2^101012221 is an apocalyptic number.

It is an amenable number.

101012221 is a deficient number, since it is larger than the sum of its proper divisors (1000223).

101012221 is a wasteful number, since it uses less digits than its factorization.

101012221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1000222.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 101012221 is about 10050.4836202046. The cubic root of 101012221 is about 465.7197332945.

Adding to 101012221 its reverse (122210101), we get a palindrome (223222322).

It can be divided in two parts, 1010 and 12221, that added together give a palindrome (13231).

The spelling of 101012221 in words is "one hundred one million, twelve thousand, two hundred twenty-one".