21113135045 has 4 divisors (see below), whose sum is σ = 25335762060. Its totient is φ = 16890508032.

The previous prime is 21113134963. The next prime is 21113135047. The reversal of 21113135045 is 54053131112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15868188961 + 5244946084 = 125969^2 + 72422^2 .

It is a cyclic number.

It is not a de Polignac number, because 21113135045 - 2⁸ = 21113134789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21113135047) 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, 2111313500 + ... + 2111313509.

It is an arithmetic number, because the mean of its divisors is an integer number (6333940515).

Almost surely, 2^21113135045 is an apocalyptic number.

It is an amenable number.

21113135045 is a deficient number, since it is larger than the sum of its proper divisors (4222627015).

21113135045 is an equidigital number, since it uses as much as digits as its factorization.

21113135045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4222627014.

The product of its (nonzero) digits is 1800, while the sum is 26.

Adding to 21113135045 its reverse (54053131112), we get a palindrome (75166266157).

The spelling of 21113135045 in words is "twenty-one billion, one hundred thirteen million, one hundred thirty-five thousand, forty-five".