102421405 has 16 divisors (see below), whose sum is σ = 125224704. Its totient is φ = 80402560.

The previous prime is 102421393. The next prime is 102421411. The reversal of 102421405 is 504124201.

It is not a de Polignac number, because 102421405 - 2¹⁷ = 102290333 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 92817 + ... + 93913.

It is an arithmetic number, because the mean of its divisors is an integer number (7826544).

Almost surely, 2^102421405 is an apocalyptic number.

It is an amenable number.

102421405 is a deficient number, since it is larger than the sum of its proper divisors (22803299).

102421405 is a wasteful number, since it uses less digits than its factorization.

102421405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1436.

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 102421405 is about 10120.3460909200. The cubic root of 102421405 is about 467.8754340720.

Adding to 102421405 its reverse (504124201), we get a palindrome (606545606).

The spelling of 102421405 in words is "one hundred two million, four hundred twenty-one thousand, four hundred five".