102121121211111 has 48 divisors (see below), whose sum is σ = 154424811853728. Its totient is φ = 64971933408000.

The previous prime is 102121121211103. The next prime is 102121121211127. The reversal of 102121121211111 is 111112121121201.

102121121211111 is a `hidden beast` number, since 10 + 212 + 1 + 121 + 211 + 111 = 666.

It is not a de Polignac number, because 102121121211111 - 2³ = 102121121211103 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102121121211311) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 10589760 + ... + 17787221.

It is an arithmetic number, because the mean of its divisors is an integer number (3217183580286).

Almost surely, 2^{102121121211111} is an apocalyptic number.

102121121211111 is a deficient number, since it is larger than the sum of its proper divisors (52303690642617).

102121121211111 is a wasteful number, since it uses less digits than its factorization.

102121121211111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28377232 (or 28377229 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 18.

Adding to 102121121211111 its reverse (111112121121201), we get a palindrome (213233242332312).

The spelling of 102121121211111 in words is "one hundred two trillion, one hundred twenty-one billion, one hundred twenty-one million, two hundred eleven thousand, one hundred eleven".