21810326036 has 6 divisors (see below), whose sum is σ = 38168070570. Its totient is φ = 10905163016.

The previous prime is 21810326033. The next prime is 21810326113. The reversal of 21810326036 is 63062301812.

It can be written as a sum of positive squares in only one way, i.e., 21629584900 + 180741136 = 147070^2 + 13444^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21810325993 and 21810326011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21810326033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2726290751 + ... + 2726290758.

It is an arithmetic number, because the mean of its divisors is an integer number (6361345095).

Almost surely, 2^21810326036 is an apocalyptic number.

It is an amenable number.

21810326036 is a deficient number, since it is larger than the sum of its proper divisors (16357744534).

21810326036 is a wasteful number, since it uses less digits than its factorization.

21810326036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5452581513 (or 5452581511 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 32.

Adding to 21810326036 its reverse (63062301812), we get a palindrome (84872627848).

The spelling of 21810326036 in words is "twenty-one billion, eight hundred ten million, three hundred twenty-six thousand, thirty-six".