101231221 has 16 divisors (see below), whose sum is σ = 131152000. Its totient is φ = 75878208.

The previous prime is 101231191. The next prime is 101231227. The reversal of 101231221 is 122132101.

It is a de Polignac number, because none of the positive numbers 2^k-101231221 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101231227) 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, 27546 + ... + 31003.

It is an arithmetic number, because the mean of its divisors is an integer number (8197000).

Almost surely, 2^101231221 is an apocalyptic number.

It is an amenable number.

101231221 is a deficient number, since it is larger than the sum of its proper divisors (29920779).

101231221 is a wasteful number, since it uses less digits than its factorization.

101231221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58588.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 101231221 is about 10061.3727194653. The cubic root of 101231221 is about 466.0560589414.

Adding to 101231221 its reverse (122132101), we get a palindrome (223363322).

The spelling of 101231221 in words is "one hundred one million, two hundred thirty-one thousand, two hundred twenty-one".