160161221 has 24 divisors (see below), whose sum is σ = 183506400. Its totient is φ = 138607200.

The previous prime is 160161193. The next prime is 160161227. The reversal of 160161221 is 122161061.

It is not a de Polignac number, because 160161221 - 2²² = 155966917 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 160161193 and 160161202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (160161227) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1152170 + ... + 1152308.

It is an arithmetic number, because the mean of its divisors is an integer number (7646100).

Almost surely, 2^160161221 is an apocalyptic number.

160161221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

160161221 is a deficient number, since it is larger than the sum of its proper divisors (23345179).

160161221 is a wasteful number, since it uses less digits than its factorization.

160161221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321 (or 290 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 160161221 is about 12655.4818557019. The cubic root of 160161221 is about 543.0658042431.

The spelling of 160161221 in words is "one hundred sixty million, one hundred sixty-one thousand, two hundred twenty-one".