21020313201029 has 2 divisors, whose sum is σ = 21020313201030. Its totient is φ = 21020313201028.

The previous prime is 21020313201011. The next prime is 21020313201049. The reversal of 21020313201029 is 92010231302012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15729140136004 + 5291173065025 = 3965998^2 + 2300255^2 .

It is a cyclic number.

It is not a de Polignac number, because 21020313201029 - 2³² = 21016018233733 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21020313200989 and 21020313201007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21020313201049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10510156600514 + 10510156600515.

It is an arithmetic number, because the mean of its divisors is an integer number (10510156600515).

Almost surely, 2^{21020313201029} is an apocalyptic number.

It is an amenable number.

21020313201029 is a deficient number, since it is larger than the sum of its proper divisors (1).

21020313201029 is an equidigital number, since it uses as much as digits as its factorization.

21020313201029 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 26.

The spelling of 21020313201029 in words is "twenty-one trillion, twenty billion, three hundred thirteen million, two hundred one thousand, twenty-nine".