102420421 has 8 divisors (see below), whose sum is σ = 104396864. Its totient is φ = 100457280.

The previous prime is 102420413. The next prime is 102420443. The reversal of 102420421 is 124024201.

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 102420421 - 2³ = 102420413 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102420395 and 102420404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102420491) 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, 12976 + ... + 19318.

It is an arithmetic number, because the mean of its divisors is an integer number (13049608).

Almost surely, 2^102420421 is an apocalyptic number.

It is an amenable number.

102420421 is a deficient number, since it is larger than the sum of its proper divisors (1976443).

102420421 is an equidigital number, since it uses as much as digits as its factorization.

102420421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6651.

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 102420421 is about 10120.2974758650. The cubic root of 102420421 is about 467.8739357169.

Adding to 102420421 its reverse (124024201), we get a palindrome (226444622).

The spelling of 102420421 in words is "one hundred two million, four hundred twenty thousand, four hundred twenty-one".