102089921 has 2 divisors, whose sum is σ = 102089922. Its totient is φ = 102089920.

The previous prime is 102089903. The next prime is 102089927. The reversal of 102089921 is 129980201.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74632321 + 27457600 = 8639^2 + 5240^2 .

It is a cyclic number.

It is not a de Polignac number, because 102089921 - 2⁶ = 102089857 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (102089927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51044960 + 51044961.

It is an arithmetic number, because the mean of its divisors is an integer number (51044961).

Almost surely, 2^102089921 is an apocalyptic number.

It is an amenable number.

102089921 is a deficient number, since it is larger than the sum of its proper divisors (1).

102089921 is an equidigital number, since it uses as much as digits as its factorization.

102089921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 102089921 is about 10103.9557105126. The cubic root of 102089921 is about 467.3701333158.

The spelling of 102089921 in words is "one hundred two million, eighty-nine thousand, nine hundred twenty-one".