162721011 has 4 divisors (see below), whose sum is σ = 216961352. Its totient is φ = 108480672.

The previous prime is 162721007. The next prime is 162721019. The reversal of 162721011 is 110127261.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 110127261 = 3 ⋅36709087.

It is not a de Polignac number, because 162721011 - 2² = 162721007 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (162721019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27120166 + ... + 27120171.

It is an arithmetic number, because the mean of its divisors is an integer number (54240338).

Almost surely, 2^162721011 is an apocalyptic number.

162721011 is a deficient number, since it is larger than the sum of its proper divisors (54240341).

162721011 is an equidigital number, since it uses as much as digits as its factorization.

162721011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54240340.

The product of its (nonzero) digits is 168, while the sum is 21.

The square root of 162721011 is about 12756.2146030866. The cubic root of 162721011 is about 545.9437241574.

Adding to 162721011 its reverse (110127261), we get a palindrome (272848272).

The spelling of 162721011 in words is "one hundred sixty-two million, seven hundred twenty-one thousand, eleven".