21031113007 has 2 divisors, whose sum is σ = 21031113008. Its totient is φ = 21031113006.

The previous prime is 21031113001. The next prime is 21031113023. The reversal of 21031113007 is 70031113012.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21031113007 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21031113001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10515556503 + 10515556504.

It is an arithmetic number, because the mean of its divisors is an integer number (10515556504).

Almost surely, 2^21031113007 is an apocalyptic number.

21031113007 is a deficient number, since it is larger than the sum of its proper divisors (1).

21031113007 is an equidigital number, since it uses as much as digits as its factorization.

21031113007 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 126, while the sum is 19.

Adding to 21031113007 its reverse (70031113012), we get a palindrome (91062226019).

The spelling of 21031113007 in words is "twenty-one billion, thirty-one million, one hundred thirteen thousand, seven".