21115430570 has 16 divisors (see below), whose sum is σ = 40931450280. Its totient is φ = 7796466624.

The previous prime is 21115430563. The next prime is 21115430573. The reversal of 21115430570 is 7503451112.

It can be written as a sum of positive squares in 4 ways, for example, as 6092270809 + 15023159761 = 78053^2 + 122569^2 .

It is a super-2 number, since 2×21115430570² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21115430573) 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 7 ways as a sum of consecutive naturals, for example, 81213065 + ... + 81213324.

Almost surely, 2^21115430570 is an apocalyptic number.

21115430570 is a deficient number, since it is larger than the sum of its proper divisors (19816019710).

21115430570 is a wasteful number, since it uses less digits than its factorization.

21115430570 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162426409.

The product of its (nonzero) digits is 4200, while the sum is 29.

Adding to 21115430570 its reverse (7503451112), we get a palindrome (28618881682).

The spelling of 21115430570 in words is "twenty-one billion, one hundred fifteen million, four hundred thirty thousand, five hundred seventy".