21151448264 has 8 divisors (see below), whose sum is σ = 39658965510. Its totient is φ = 10575724128.

The previous prime is 21151448251. The next prime is 21151448317. The reversal of 21151448264 is 46284415112.

It can be written as a sum of positive squares in only one way, i.e., 20773456900 + 377991364 = 144130^2 + 19442^2 .

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

It is a super-2 number, since 2×21151448264² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 1321965509 + ... + 1321965524.

Almost surely, 2^21151448264 is an apocalyptic number.

It is an amenable number.

21151448264 is a deficient number, since it is larger than the sum of its proper divisors (18507517246).

21151448264 is a wasteful number, since it uses less digits than its factorization.

21151448264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2643931039 (or 2643931035 counting only the distinct ones).

The product of its digits is 61440, while the sum is 38.

The spelling of 21151448264 in words is "twenty-one billion, one hundred fifty-one million, four hundred forty-eight thousand, two hundred sixty-four".