102665421 has 16 divisors (see below), whose sum is σ = 153014400. Its totient is φ = 68030784.

The previous prime is 102665419. The next prime is 102665441. The reversal of 102665421 is 124566201.

102665421 is a `hidden beast` number, since 1 + 0 + 2 + 6 + 654 + 2 + 1 = 666.

It is not a de Polignac number, because 102665421 - 2¹ = 102665419 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102665401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6876 + ... + 15893.

It is an arithmetic number, because the mean of its divisors is an integer number (9563400).

Almost surely, 2^102665421 is an apocalyptic number.

It is an amenable number.

102665421 is a deficient number, since it is larger than the sum of its proper divisors (50348979).

102665421 is a wasteful number, since it uses less digits than its factorization.

102665421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22945 (or 22939 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 102665421 is about 10132.3946330569. The cubic root of 102665421 is about 468.2467058895.

The spelling of 102665421 in words is "one hundred two million, six hundred sixty-five thousand, four hundred twenty-one".