102121312111 has 20 divisors (see below), whose sum is σ = 126435817232. Its totient is φ = 80799121728.

The previous prime is 102121312103. The next prime is 102121312129. The reversal of 102121312111 is 111213121201.

It is a happy number.

It is not a de Polignac number, because 102121312111 - 2³ = 102121312103 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 (102121312171) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 55470 + ... + 455323.

Almost surely, 2^102121312111 is an apocalyptic number.

102121312111 is a deficient number, since it is larger than the sum of its proper divisors (24314505121).

102121312111 is an frugal number, since it uses more digits than its factorization.

102121312111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 510852 (or 510813 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 16.

Adding to 102121312111 its reverse (111213121201), we get a palindrome (213334433312).

The spelling of 102121312111 in words is "one hundred two billion, one hundred twenty-one million, three hundred twelve thousand, one hundred eleven".