264553320021 has 16 divisors (see below), whose sum is σ = 360288165888. Its totient is φ = 172594622000.

The previous prime is 264553320019. The next prime is 264553320067. The reversal of 264553320021 is 120023355462.

It is a happy number.

It is not a de Polignac number, because 264553320021 - 2¹ = 264553320019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (264553320001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1046596 + ... + 1274546.

It is an arithmetic number, because the mean of its divisors is an integer number (22518010368).

Almost surely, 2^264553320021 is an apocalyptic number.

It is an amenable number.

264553320021 is a deficient number, since it is larger than the sum of its proper divisors (95734845867).

264553320021 is a wasteful number, since it uses less digits than its factorization.

264553320021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236232.

The product of its (nonzero) digits is 43200, while the sum is 33.

Adding to 264553320021 its reverse (120023355462), we get a palindrome (384576675483).

The spelling of 264553320021 in words is "two hundred sixty-four billion, five hundred fifty-three million, three hundred twenty thousand, twenty-one".