21857267930 has 16 divisors (see below), whose sum is σ = 39365973864. Its totient is φ = 8737820160.

The previous prime is 21857267903. The next prime is 21857267947. The reversal of 21857267930 is 3976275812.

It can be written as a sum of positive squares in 4 ways, for example, as 21595184209 + 262083721 = 146953^2 + 16189^2 .

It is a super-2 number, since 2×21857267930² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 617807 + ... + 652226.

Almost surely, 2^21857267930 is an apocalyptic number.

21857267930 is a deficient number, since it is larger than the sum of its proper divisors (17508705934).

21857267930 is a wasteful number, since it uses less digits than its factorization.

21857267930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1271761.

The product of its (nonzero) digits is 1270080, while the sum is 50.

The spelling of 21857267930 in words is "twenty-one billion, eight hundred fifty-seven million, two hundred sixty-seven thousand, nine hundred thirty".