162142021 has 4 divisors (see below), whose sum is σ = 162269100. Its totient is φ = 162014944.

The previous prime is 162142007. The next prime is 162142031. The reversal of 162142021 is 120241261.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 104837121 + 57304900 = 10239^2 + 7570^2 .

It is a cyclic number.

It is not a de Polignac number, because 162142021 - 2⁵ = 162141989 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 162142021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (162142031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61606 + ... + 64183.

It is an arithmetic number, because the mean of its divisors is an integer number (40567275).

Almost surely, 2^162142021 is an apocalyptic number.

It is an amenable number.

162142021 is a deficient number, since it is larger than the sum of its proper divisors (127079).

162142021 is a wasteful number, since it uses less digits than its factorization.

162142021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127078.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 162142021 is about 12733.4999509169. The cubic root of 162142021 is about 545.2954333474.

Adding to 162142021 its reverse (120241261), we get a palindrome (282383282).

The spelling of 162142021 in words is "one hundred sixty-two million, one hundred forty-two thousand, twenty-one".