102011221 has 16 divisors (see below), whose sum is σ = 111626368. Its totient is φ = 92664000.

The previous prime is 102011219. The next prime is 102011227. The reversal of 102011221 is 122110201.

It is not a de Polignac number, because 102011221 - 2¹ = 102011219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102011198 and 102011207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102011227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 308026 + ... + 308356.

It is an arithmetic number, because the mean of its divisors is an integer number (6976648).

Almost surely, 2^102011221 is an apocalyptic number.

It is an amenable number.

102011221 is a deficient number, since it is larger than the sum of its proper divisors (9615147).

102011221 is a wasteful number, since it uses less digits than its factorization.

102011221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 652.

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

The square root of 102011221 is about 10100.0604453637. The cubic root of 102011221 is about 467.2500056062.

Adding to 102011221 its reverse (122110201), we get a palindrome (224121422).

It can be divided in two parts, 10201 and 1221, that multiplied together give a palindrome (12455421).

The spelling of 102011221 in words is "one hundred two million, eleven thousand, two hundred twenty-one".