21122064755 has 32 divisors (see below), whose sum is σ = 28489606848. Its totient is φ = 14898124800.

The previous prime is 21122064727. The next prime is 21122064757. The reversal of 21122064755 is 55746022112.

It is not a de Polignac number, because 21122064755 - 2⁸ = 21122064499 is a prime.

It is a super-2 number, since 2×21122064755² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21122064757) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 620375 + ... + 653535.

It is an arithmetic number, because the mean of its divisors is an integer number (890300214).

Almost surely, 2^21122064755 is an apocalyptic number.

21122064755 is a deficient number, since it is larger than the sum of its proper divisors (7367542093).

21122064755 is a wasteful number, since it uses less digits than its factorization.

21122064755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33527.

The product of its (nonzero) digits is 33600, while the sum is 35.

Adding to 21122064755 its reverse (55746022112), we get a palindrome (76868086867).

The spelling of 21122064755 in words is "twenty-one billion, one hundred twenty-two million, sixty-four thousand, seven hundred fifty-five".