163145421 has 10 divisors (see below), whose sum is σ = 243711182. Its totient is φ = 108763560.

The previous prime is 163145377. The next prime is 163145429. The reversal of 163145421 is 124541361.

It is a happy number.

163145421 is a `hidden beast` number, since 1 + 631 + 4 + 5 + 4 + 21 = 666.

It can be written as a sum of positive squares in only one way, i.e., 112593321 + 50552100 = 10611^2 + 7110^2 .

It is not a de Polignac number, because 163145421 - 2¹⁷ = 163014349 is a prime.

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

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163145429) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1006990 + ... + 1007151.

Almost surely, 2^163145421 is an apocalyptic number.

It is an amenable number.

163145421 is a deficient number, since it is larger than the sum of its proper divisors (80565761).

163145421 is an equidigital number, since it uses as much as digits as its factorization.

163145421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2014153 (or 2014144 counting only the distinct ones).

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

The square root of 163145421 is about 12772.8391910334. The cubic root of 163145421 is about 546.4179567554.

Adding to 163145421 its reverse (124541361), we get a palindrome (287686782).

The spelling of 163145421 in words is "one hundred sixty-three million, one hundred forty-five thousand, four hundred twenty-one".