102420505 has 16 divisors (see below), whose sum is σ = 134325504. Its totient is φ = 74350080.

The previous prime is 102420499. The next prime is 102420511. The reversal of 102420505 is 505024201.

It is an interprime number because it is at equal distance from previous prime (102420499) and next prime (102420511).

It is not a de Polignac number, because 102420505 - 2⁷ = 102420377 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 in 15 ways as a sum of consecutive naturals, for example, 35632 + ... + 38398.

It is an arithmetic number, because the mean of its divisors is an integer number (8395344).

Almost surely, 2^102420505 is an apocalyptic number.

It is an amenable number.

102420505 is a deficient number, since it is larger than the sum of its proper divisors (31904999).

102420505 is a wasteful number, since it uses less digits than its factorization.

102420505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3456.

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 102420505 is about 10120.3016259398. The cubic root of 102420505 is about 467.8740636256.

Adding to 102420505 its reverse (505024201), we get a palindrome (607444706).

The spelling of 102420505 in words is "one hundred two million, four hundred twenty thousand, five hundred five".