21113051071 has 16 divisors (see below), whose sum is σ = 24388506688. Its totient is φ = 17903462400.

The previous prime is 21113051059. The next prime is 21113051081. The reversal of 21113051071 is 17015031112.

It is a cyclic number.

It is not a de Polignac number, because 21113051071 - 2⁹ = 21113050559 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21113051081) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 201361 + ... + 287701.

It is an arithmetic number, because the mean of its divisors is an integer number (1524281668).

Almost surely, 2^21113051071 is an apocalyptic number.

21113051071 is a deficient number, since it is larger than the sum of its proper divisors (3275455617).

21113051071 is a wasteful number, since it uses less digits than its factorization.

21113051071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86722.

The product of its (nonzero) digits is 210, while the sum is 22.

Adding to 21113051071 its reverse (17015031112), we get a palindrome (38128082183).

The spelling of 21113051071 in words is "twenty-one billion, one hundred thirteen million, fifty-one thousand, seventy-one".