102066421 has 2 divisors, whose sum is σ = 102066422. Its totient is φ = 102066420.

The previous prime is 102066413. The next prime is 102066463. The reversal of 102066421 is 124660201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 95746225 + 6320196 = 9785^2 + 2514^2 .

It is a cyclic number.

It is not a de Polignac number, because 102066421 - 2³ = 102066413 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 102066392 and 102066401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102066491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51033210 + 51033211.

It is an arithmetic number, because the mean of its divisors is an integer number (51033211).

Almost surely, 2^102066421 is an apocalyptic number.

It is an amenable number.

102066421 is a deficient number, since it is larger than the sum of its proper divisors (1).

102066421 is an equidigital number, since it uses as much as digits as its factorization.

102066421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 102066421 is about 10102.7927327052. The cubic root of 102066421 is about 467.3342693740.

The spelling of 102066421 in words is "one hundred two million, sixty-six thousand, four hundred twenty-one".