102855021 has 4 divisors (see below), whose sum is σ = 137140032. Its totient is φ = 68570012.

The previous prime is 102855007. The next prime is 102855041. The reversal of 102855021 is 120558201.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 102855021 - 2⁵ = 102854989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 102854982 and 102855000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102855041) 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, 17142501 + ... + 17142506.

It is an arithmetic number, because the mean of its divisors is an integer number (34285008).

Almost surely, 2^102855021 is an apocalyptic number.

It is an amenable number.

102855021 is a deficient number, since it is larger than the sum of its proper divisors (34285011).

102855021 is an equidigital number, since it uses as much as digits as its factorization.

102855021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34285010.

The product of its (nonzero) digits is 800, while the sum is 24.

The square root of 102855021 is about 10141.7464472348. The cubic root of 102855021 is about 468.5347774998.

The spelling of 102855021 in words is "one hundred two million, eight hundred fifty-five thousand, twenty-one".