321920011 has 16 divisors (see below), whose sum is σ = 375391744. Its totient is φ = 270376704.

The previous prime is 321919963. The next prime is 321920047. The reversal of 321920011 is 110029123.

321920011 = 434² + 435² + ... + 1015².

It is a cyclic number.

It is not a de Polignac number, because 321920011 - 2⁷ = 321919883 is a prime.

It is not an unprimeable number, because it can be changed into a prime (321920411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67636 + ... + 72238.

It is an arithmetic number, because the mean of its divisors is an integer number (23461984).

Almost surely, 2^321920011 is an apocalyptic number.

321920011 is a deficient number, since it is larger than the sum of its proper divisors (53471733).

321920011 is a wasteful number, since it uses less digits than its factorization.

321920011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4810.

The product of its (nonzero) digits is 108, while the sum is 19.

The square root of 321920011 is about 17942.1295001457. The cubic root of 321920011 is about 685.3556403563.

Adding to 321920011 its reverse (110029123), we get a palindrome (431949134).

The spelling of 321920011 in words is "three hundred twenty-one million, nine hundred twenty thousand, eleven".