102105421 has 8 divisors (see below), whose sum is σ = 112099104. Its totient is φ = 92230320.

The previous prime is 102105407. The next prime is 102105431. The reversal of 102105421 is 124501201.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 102105421 - 2⁵ = 102105389 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102105395 and 102105404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102105431) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27835 + ... + 31288.

It is an arithmetic number, because the mean of its divisors is an integer number (14012388).

Almost surely, 2^102105421 is an apocalyptic number.

102105421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

102105421 is a deficient number, since it is larger than the sum of its proper divisors (9993683).

102105421 is a wasteful number, since it uses less digits than its factorization.

102105421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59291.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 102105421 is about 10104.7227077243. The cubic root of 102105421 is about 467.3937852441.

Adding to 102105421 its reverse (124501201), we get a palindrome (226606622).

The spelling of 102105421 in words is "one hundred two million, one hundred five thousand, four hundred twenty-one".