21840310036 has 12 divisors (see below), whose sum is σ = 38229669940. Its totient is φ = 10917547200.

The previous prime is 21840310033. The next prime is 21840310039. The reversal of 21840310036 is 63001304812.

It is an interprime number because it is at equal distance from previous prime (21840310033) and next prime (21840310039).

It can be written as a sum of positive squares in 2 ways, for example, as 4533328900 + 17306981136 = 67330^2 + 131556^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21840309986 and 21840310013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21840310033) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 633051 + ... + 666658.

Almost surely, 2^21840310036 is an apocalyptic number.

It is an amenable number.

21840310036 is a deficient number, since it is larger than the sum of its proper divisors (16389359904).

21840310036 is a wasteful number, since it uses less digits than its factorization.

21840310036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1303914 (or 1303912 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 28.

Adding to 21840310036 its reverse (63001304812), we get a palindrome (84841614848).

The spelling of 21840310036 in words is "twenty-one billion, eight hundred forty million, three hundred ten thousand, thirty-six".