160021521 has 32 divisors (see below), whose sum is σ = 261181440. Its totient is φ = 96022800.

The previous prime is 160021517. The next prime is 160021523. The reversal of 160021521 is 125120061.

It is not a de Polignac number, because 160021521 - 2² = 160021517 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 160021494 and 160021503.

It is not an unprimeable number, because it can be changed into a prime (160021523) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 27976 + ... + 33206.

It is an arithmetic number, because the mean of its divisors is an integer number (8161920).

Almost surely, 2^160021521 is an apocalyptic number.

160021521 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

160021521 is a deficient number, since it is larger than the sum of its proper divisors (101159919).

160021521 is a wasteful number, since it uses less digits than its factorization.

160021521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5354 (or 5348 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 160021521 is about 12649.9613042886. The cubic root of 160021521 is about 542.9078626367.

Adding to 160021521 its reverse (125120061), we get a palindrome (285141582).

The spelling of 160021521 in words is "one hundred sixty million, twenty-one thousand, five hundred twenty-one".