21755080264 has 8 divisors (see below), whose sum is σ = 40790775510. Its totient is φ = 10877540128.

The previous prime is 21755080261. The next prime is 21755080267. The reversal of 21755080264 is 46208055712.

It is an interprime number because it is at equal distance from previous prime (21755080261) and next prime (21755080267).

It can be written as a sum of positive squares in only one way, i.e., 18931008100 + 2824072164 = 137590^2 + 53142^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (21755080261) 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 as a sum of consecutive naturals, namely, 1359692509 + ... + 1359692524.

Almost surely, 2^21755080264 is an apocalyptic number.

It is an amenable number.

21755080264 is a deficient number, since it is larger than the sum of its proper divisors (19035695246).

21755080264 is a wasteful number, since it uses less digits than its factorization.

21755080264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2719385039 (or 2719385035 counting only the distinct ones).

The product of its (nonzero) digits is 134400, while the sum is 40.

The spelling of 21755080264 in words is "twenty-one billion, seven hundred fifty-five million, eighty thousand, two hundred sixty-four".