21106753741 has 2 divisors, whose sum is σ = 21106753742. Its totient is φ = 21106753740.

The previous prime is 21106753739. The next prime is 21106753757. The reversal of 21106753741 is 14735760112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14453088841 + 6653664900 = 120221^2 + 81570^2 .

It is a cyclic number.

It is not a de Polignac number, because 21106753741 - 2¹ = 21106753739 is a prime.

Together with 21106753739, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21106753741.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21106753721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10553376870 + 10553376871.

It is an arithmetic number, because the mean of its divisors is an integer number (10553376871).

Almost surely, 2^21106753741 is an apocalyptic number.

It is an amenable number.

21106753741 is a deficient number, since it is larger than the sum of its proper divisors (1).

21106753741 is an equidigital number, since it uses as much as digits as its factorization.

21106753741 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 35280, while the sum is 37.

The spelling of 21106753741 in words is "twenty-one billion, one hundred six million, seven hundred fifty-three thousand, seven hundred forty-one".