102115211 has 4 divisors (see below), whose sum is σ = 111398424. Its totient is φ = 92832000.

The previous prime is 102115207. The next prime is 102115217. The reversal of 102115211 is 112511201.

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 102115211 - 2² = 102115207 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (102115217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4641590 + ... + 4641611.

It is an arithmetic number, because the mean of its divisors is an integer number (27849606).

Almost surely, 2^102115211 is an apocalyptic number.

102115211 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

102115211 is a deficient number, since it is larger than the sum of its proper divisors (9283213).

102115211 is an equidigital number, since it uses as much as digits as its factorization.

102115211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9283212.

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

The square root of 102115211 is about 10105.2071230628. The cubic root of 102115211 is about 467.4087228739.

Adding to 102115211 its reverse (112511201), we get a palindrome (214626412).

The spelling of 102115211 in words is "one hundred two million, one hundred fifteen thousand, two hundred eleven".