102121111 has 4 divisors (see below), whose sum is σ = 102691800. Its totient is φ = 101550424.

The previous prime is 102121109. The next prime is 102121133. The reversal of 102121111 is 111121201.

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

It is a cyclic number.

It is not a de Polignac number, because 102121111 - 2¹ = 102121109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102121141) 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, 285076 + ... + 285433.

It is an arithmetic number, because the mean of its divisors is an integer number (25672950).

Almost surely, 2^102121111 is an apocalyptic number.

102121111 is a deficient number, since it is larger than the sum of its proper divisors (570689).

102121111 is an equidigital number, since it uses as much as digits as its factorization.

102121111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 570688.

The product of its (nonzero) digits is 4, while the sum is 10.

The square root of 102121111 is about 10105.4990475483. The cubic root of 102121111 is about 467.4177246616.

Adding to 102121111 its reverse (111121201), we get a palindrome (213242312).

The spelling of 102121111 in words is "one hundred two million, one hundred twenty-one thousand, one hundred eleven".