102550921 has 4 divisors (see below), whose sum is σ = 111873744. Its totient is φ = 93228100.

The previous prime is 102550913. The next prime is 102550949. The reversal of 102550921 is 129055201.

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 102550921 - 2³ = 102550913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (102550991) 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, 4661395 + ... + 4661416.

It is an arithmetic number, because the mean of its divisors is an integer number (27968436).

Almost surely, 2^102550921 is an apocalyptic number.

102550921 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

102550921 is a deficient number, since it is larger than the sum of its proper divisors (9322823).

102550921 is an equidigital number, since it uses as much as digits as its factorization.

102550921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9322822.

The product of its (nonzero) digits is 900, while the sum is 25.

The square root of 102550921 is about 10126.7428623423. The cubic root of 102550921 is about 468.0725667906.

The spelling of 102550921 in words is "one hundred two million, five hundred fifty thousand, nine hundred twenty-one".