21106140613 has 2 divisors, whose sum is σ = 21106140614. Its totient is φ = 21106140612.

The previous prime is 21106140607. The next prime is 21106140631. The reversal of 21106140613 is 31604160112.

Together with next prime (21106140631) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14800668964 + 6305471649 = 121658^2 + 79407^2 .

It is a cyclic number.

It is not a de Polignac number, because 21106140613 - 2⁵ = 21106140581 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21106140413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10553070306 + 10553070307.

It is an arithmetic number, because the mean of its divisors is an integer number (10553070307).

Almost surely, 2^21106140613 is an apocalyptic number.

It is an amenable number.

21106140613 is a deficient number, since it is larger than the sum of its proper divisors (1).

21106140613 is an equidigital number, since it uses as much as digits as its factorization.

21106140613 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 25.

The spelling of 21106140613 in words is "twenty-one billion, one hundred six million, one hundred forty thousand, six hundred thirteen".