21072630344 has 8 divisors (see below), whose sum is σ = 39511181910. Its totient is φ = 10536315168.

The previous prime is 21072630343. The next prime is 21072630367. The reversal of 21072630344 is 44303627012.

It can be written as a sum of positive squares in only one way, i.e., 21072006244 + 624100 = 145162^2 + 790^2 .

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

It is a super-2 number, since 2×21072630344² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21072630344.

It is not an unprimeable number, because it can be changed into a prime (21072630343) 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, 1317039389 + ... + 1317039404.

Almost surely, 2^21072630344 is an apocalyptic number.

It is an amenable number.

21072630344 is a deficient number, since it is larger than the sum of its proper divisors (18438551566).

21072630344 is a wasteful number, since it uses less digits than its factorization.

21072630344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2634078799 (or 2634078795 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 32.

The spelling of 21072630344 in words is "twenty-one billion, seventy-two million, six hundred thirty thousand, three hundred forty-four".