102111215 has 4 divisors (see below), whose sum is σ = 122533464. Its totient is φ = 81688968.

The previous prime is 102111203. The next prime is 102111239. The reversal of 102111215 is 512111201.

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 102111215 - 2⁴ = 102111199 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 102111215.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10211117 + ... + 10211126.

It is an arithmetic number, because the mean of its divisors is an integer number (30633366).

Almost surely, 2^102111215 is an apocalyptic number.

102111215 is a deficient number, since it is larger than the sum of its proper divisors (20422249).

102111215 is an equidigital number, since it uses as much as digits as its factorization.

102111215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20422248.

The product of its (nonzero) digits is 20, while the sum is 14.

The square root of 102111215 is about 10105.0094012821. The cubic root of 102111215 is about 467.4026258729.

Subtracting from 102111215 its sum of digits (14), we obtain a palindrome (102111201).

Adding to 102111215 its reverse (512111201), we get a palindrome (614222416).

The spelling of 102111215 in words is "one hundred two million, one hundred eleven thousand, two hundred fifteen".