321620011 has 4 divisors (see below), whose sum is σ = 338547400. Its totient is φ = 304692624.

The previous prime is 321619997. The next prime is 321620029. The reversal of 321620011 is 110026123.

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

It is a cyclic number.

It is not a de Polignac number, because 321620011 - 2⁵ = 321619979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (321620041) 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, 8463666 + ... + 8463703.

It is an arithmetic number, because the mean of its divisors is an integer number (84636850).

Almost surely, 2^321620011 is an apocalyptic number.

321620011 is a deficient number, since it is larger than the sum of its proper divisors (16927389).

321620011 is a wasteful number, since it uses less digits than its factorization.

321620011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16927388.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 321620011 is about 17933.7673398536. The cubic root of 321620011 is about 685.1426779359.

Adding to 321620011 its reverse (110026123), we get a palindrome (431646134).

The spelling of 321620011 in words is "three hundred twenty-one million, six hundred twenty thousand, eleven".