21110353245 has 60 divisors (see below), whose sum is σ = 40199443284. Its totient is φ = 10596510720.

The previous prime is 21110353241. The next prime is 21110353283. The reversal of 21110353245 is 54235301112.

21110353245 is a `hidden beast` number, since 21 + 1 + 103 + 532 + 4 + 5 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 1203118596 + 19907234649 = 34686^2 + 141093^2 .

It is not a de Polignac number, because 21110353245 - 2² = 21110353241 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21110353241) 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 59 ways as a sum of consecutive naturals, for example, 26865 + ... + 207225.

Almost surely, 2^21110353245 is an apocalyptic number.

It is an amenable number.

21110353245 is a deficient number, since it is larger than the sum of its proper divisors (19089090039).

21110353245 is a wasteful number, since it uses less digits than its factorization.

21110353245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180412 (or 180386 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

Adding to 21110353245 its reverse (54235301112), we get a palindrome (75345654357).

The spelling of 21110353245 in words is "twenty-one billion, one hundred ten million, three hundred fifty-three thousand, two hundred forty-five".