102211221 has 16 divisors (see below), whose sum is σ = 156313728. Its totient is φ = 58195200.

The previous prime is 102211217. The next prime is 102211231. The reversal of 102211221 is 122112201.

It is not a de Polignac number, because 102211221 - 2² = 102211217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 102211197 and 102211206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102211231) 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, 2760 + ... + 14561.

It is an arithmetic number, because the mean of its divisors is an integer number (9769608).

Almost surely, 2^102211221 is an apocalyptic number.

It is an amenable number.

102211221 is a deficient number, since it is larger than the sum of its proper divisors (54102507).

102211221 is a wasteful number, since it uses less digits than its factorization.

102211221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17612.

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

The square root of 102211221 is about 10109.9565280964. The cubic root of 102211221 is about 467.5551648325. Note that the first 3 decimals are identical.

Adding to 102211221 its reverse (122112201), we get a palindrome (224323422).

The spelling of 102211221 in words is "one hundred two million, two hundred eleven thousand, two hundred twenty-one".