21036253741 has 2 divisors, whose sum is σ = 21036253742. Its totient is φ = 21036253740.

The previous prime is 21036253727. The next prime is 21036253751. The reversal of 21036253741 is 14735263012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17948228841 + 3088024900 = 133971^2 + 55570^2 .

It is a cyclic number.

It is not a de Polignac number, because 21036253741 - 2⁵ = 21036253709 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21036253697 and 21036253706.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21036253751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10518126870 + 10518126871.

It is an arithmetic number, because the mean of its divisors is an integer number (10518126871).

Almost surely, 2^21036253741 is an apocalyptic number.

It is an amenable number.

21036253741 is a deficient number, since it is larger than the sum of its proper divisors (1).

21036253741 is an equidigital number, since it uses as much as digits as its factorization.

21036253741 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30240, while the sum is 34.

The spelling of 21036253741 in words is "twenty-one billion, thirty-six million, two hundred fifty-three thousand, seven hundred forty-one".