102139211 has 4 divisors (see below), whose sum is σ = 102383400. Its totient is φ = 101895024.

The previous prime is 102139201. The next prime is 102139237. The reversal of 102139211 is 112931201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 112931201 = 43 ⋅2626307.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102139211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (102139201) 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, 121466 + ... + 122303.

It is an arithmetic number, because the mean of its divisors is an integer number (25595850).

Almost surely, 2^102139211 is an apocalyptic number.

102139211 is a deficient number, since it is larger than the sum of its proper divisors (244189).

102139211 is an equidigital number, since it uses as much as digits as its factorization.

102139211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244188.

The product of its (nonzero) digits is 108, while the sum is 20.

The square root of 102139211 is about 10106.3945598814. The cubic root of 102139211 is about 467.4453381522.

The spelling of 102139211 in words is "one hundred two million, one hundred thirty-nine thousand, two hundred eleven".