102305421 has 6 divisors (see below), whose sum is σ = 147774510. Its totient is φ = 68203608.

The previous prime is 102305419. The next prime is 102305431. The reversal of 102305421 is 124503201.

102305421 is a `hidden beast` number, since 10 + 230 + 5 + 421 = 666.

It can be written as a sum of positive squares in only one way, i.e., 97416900 + 4888521 = 9870^2 + 2211^2 .

It is not a de Polignac number, because 102305421 - 2¹ = 102305419 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 102305394 and 102305403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102305431) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5683626 + ... + 5683643.

It is an arithmetic number, because the mean of its divisors is an integer number (24629085).

Almost surely, 2^102305421 is an apocalyptic number.

It is an amenable number.

102305421 is a deficient number, since it is larger than the sum of its proper divisors (45469089).

102305421 is a wasteful number, since it uses less digits than its factorization.

102305421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11367275 (or 11367272 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 102305421 is about 10114.6142289264. The cubic root of 102305421 is about 467.6987569369.

Adding to 102305421 its reverse (124503201), we get a palindrome (226808622).

It can be divided in two parts, 10230 and 5421, that added together give a palindrome (15651).

The spelling of 102305421 in words is "one hundred two million, three hundred five thousand, four hundred twenty-one".