101221221 has 16 divisors (see below), whose sum is σ = 139788288. Its totient is φ = 65108400.

The previous prime is 101221201. The next prime is 101221259. The reversal of 101221221 is 122122101.

It is not a de Polignac number, because 101221221 - 2¹³ = 101213029 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 101221197 and 101221206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101221201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4956 + ... + 15066.

It is an arithmetic number, because the mean of its divisors is an integer number (8736768).

Almost surely, 2^101221221 is an apocalyptic number.

It is an amenable number.

101221221 is a deficient number, since it is larger than the sum of its proper divisors (38567067).

101221221 is a wasteful number, since it uses less digits than its factorization.

101221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10232.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 101221221 is about 10060.8757571098. The cubic root of 101221221 is about 466.0407121804.

Adding to 101221221 its reverse (122122101), we get a palindrome (223343322).

The spelling of 101221221 in words is "one hundred one million, two hundred twenty-one thousand, two hundred twenty-one".