165012421 has 8 divisors (see below), whose sum is σ = 199679040. Its totient is φ = 133119168.

The previous prime is 165012409. The next prime is 165012427. The reversal of 165012421 is 124210561.

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

It is not a de Polignac number, because 165012421 - 2⁵ = 165012389 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 165012392 and 165012401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165012427) 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, 693211 + ... + 693448.

It is an arithmetic number, because the mean of its divisors is an integer number (24959880).

Almost surely, 2^165012421 is an apocalyptic number.

It is an amenable number.

165012421 is a deficient number, since it is larger than the sum of its proper divisors (34666619).

165012421 is a wasteful number, since it uses less digits than its factorization.

165012421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1386683.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 165012421 is about 12845.7160563357. The cubic root of 165012421 is about 548.4944178842.

Adding to 165012421 its reverse (124210561), we get a palindrome (289222982).

The spelling of 165012421 in words is "one hundred sixty-five million, twelve thousand, four hundred twenty-one".