21110000137 has 2 divisors, whose sum is σ = 21110000138. Its totient is φ = 21110000136.

The previous prime is 21110000101. The next prime is 21110000207. The reversal of 21110000137 is 73100001112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10571129856 + 10538870281 = 102816^2 + 102659^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21110000137 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21110000137.

It is not a weakly prime, because it can be changed into another prime (21110000837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10555000068 + 10555000069.

It is an arithmetic number, because the mean of its divisors is an integer number (10555000069).

Almost surely, 2^21110000137 is an apocalyptic number.

It is an amenable number.

21110000137 is a deficient number, since it is larger than the sum of its proper divisors (1).

21110000137 is an equidigital number, since it uses as much as digits as its factorization.

21110000137 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 42, while the sum is 16.

Adding to 21110000137 its reverse (73100001112), we get a palindrome (94210001249).

The spelling of 21110000137 in words is "twenty-one billion, one hundred ten million, one hundred thirty-seven", and thus it is an aban number.