102815421 has 8 divisors (see below), whose sum is σ = 137845344. Its totient is φ = 68164560.

The previous prime is 102815399. The next prime is 102815429. The reversal of 102815421 is 124518201.

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

It is not a de Polignac number, because 102815421 - 2¹⁸ = 102553277 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 102815391 and 102815400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102815429) 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, 94131 + ... + 95216.

It is an arithmetic number, because the mean of its divisors is an integer number (17230668).

Almost surely, 2^102815421 is an apocalyptic number.

It is an amenable number.

102815421 is a deficient number, since it is larger than the sum of its proper divisors (35029923).

102815421 is a wasteful number, since it uses less digits than its factorization.

102815421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189531.

The product of its (nonzero) digits is 640, while the sum is 24.

The square root of 102815421 is about 10139.7939328174. The cubic root of 102815421 is about 468.4746399111.

The spelling of 102815421 in words is "one hundred two million, eight hundred fifteen thousand, four hundred twenty-one".