159912021 has 8 divisors (see below), whose sum is σ = 213636960. Its totient is φ = 106397552.

The previous prime is 159911993. The next prime is 159912023. The reversal of 159912021 is 120219951.

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 159912021 - 2⁵ = 159911989 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 159912021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (159912023) 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, 50835 + ... + 53888.

It is an arithmetic number, because the mean of its divisors is an integer number (26704620).

Almost surely, 2^159912021 is an apocalyptic number.

It is an amenable number.

159912021 is a deficient number, since it is larger than the sum of its proper divisors (53724939).

159912021 is a wasteful number, since it uses less digits than its factorization.

159912021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105235.

The product of its (nonzero) digits is 1620, while the sum is 30.

The square root of 159912021 is about 12645.6324871475. The cubic root of 159912021 is about 542.7840001804.

The spelling of 159912021 in words is "one hundred fifty-nine million, nine hundred twelve thousand, twenty-one".