161421200 has 30 divisors (see below), whose sum is σ = 387815394. Its totient is φ = 64568320.

The previous prime is 161421187. The next prime is 161421203. The reversal of 161421200 is 2124161.

161421200 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 29584 + 161391616 = 172^2 + 12704^2 .

It is not an unprimeable number, because it can be changed into a prime (161421203) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 201377 + ... + 202176.

Almost surely, 2^161421200 is an apocalyptic number.

161421200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161421200 is an abundant number, since it is smaller than the sum of its proper divisors (226394194).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161421200 is a wasteful number, since it uses less digits than its factorization.

161421200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 403571 (or 403560 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 161421200 is about 12705.1643043292. The cubic root of 161421200 is about 544.4861750913.

Adding to 161421200 its reverse (2124161), we get a palindrome (163545361).

The spelling of 161421200 in words is "one hundred sixty-one million, four hundred twenty-one thousand, two hundred".