21110456036 has 6 divisors (see below), whose sum is σ = 36943298070. Its totient is φ = 10555228016.

The previous prime is 21110456009. The next prime is 21110456039. The reversal of 21110456036 is 63065401112.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 11224131136 + 9886324900 = 105944^2 + 99430^2 .

It is not an unprimeable number, because it can be changed into a prime (21110456039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2638807001 + ... + 2638807008.

It is an arithmetic number, because the mean of its divisors is an integer number (6157216345).

Almost surely, 2^21110456036 is an apocalyptic number.

It is an amenable number.

21110456036 is a deficient number, since it is larger than the sum of its proper divisors (15832842034).

21110456036 is a wasteful number, since it uses less digits than its factorization.

21110456036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5277614013 (or 5277614011 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 29.

Adding to 21110456036 its reverse (63065401112), we get a palindrome (84175857148).

The spelling of 21110456036 in words is "twenty-one billion, one hundred ten million, four hundred fifty-six thousand, thirty-six".