102121879 has 2 divisors, whose sum is σ = 102121880. Its totient is φ = 102121878.

The previous prime is 102121871. The next prime is 102121883. The reversal of 102121879 is 978121201.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 102121879 - 2³ = 102121871 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 102121879.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102121871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51060939 + 51060940.

It is an arithmetic number, because the mean of its divisors is an integer number (51060940).

Almost surely, 2^102121879 is an apocalyptic number.

102121879 is a deficient number, since it is larger than the sum of its proper divisors (1).

102121879 is an equidigital number, since it uses as much as digits as its factorization.

102121879 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 31.

The square root of 102121879 is about 10105.5370465899. The cubic root of 102121879 is about 467.4188963942.

The spelling of 102121879 in words is "one hundred two million, one hundred twenty-one thousand, eight hundred seventy-nine".