160257253121221 has 8 divisors (see below), whose sum is σ = 162454010548824. Its totient is φ = 158060534952960.

The previous prime is 160257253121183. The next prime is 160257253121237. The reversal of 160257253121221 is 122121352752061.

It can be written as a sum of positive squares in 4 ways, for example, as 82276237890625 + 77981015230596 = 9070625^2 + 8830686^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 160257253121221 - 2⁷ = 160257253121093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (160257253121261) 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, 1547446 + ... + 17969671.

It is an arithmetic number, because the mean of its divisors is an integer number (20306751318603).

Almost surely, 2^{160257253121221} is an apocalyptic number.

It is an amenable number.

160257253121221 is a deficient number, since it is larger than the sum of its proper divisors (2196757427603).

160257253121221 is a wasteful number, since it uses less digits than its factorization.

160257253121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19629671.

The product of its (nonzero) digits is 100800, while the sum is 40.

The spelling of 160257253121221 in words is "one hundred sixty trillion, two hundred fifty-seven billion, two hundred fifty-three million, one hundred twenty-one thousand, two hundred twenty-one".