21020313201049 has 2 divisors, whose sum is σ = 21020313201050. Its totient is φ = 21020313201048.

The previous prime is 21020313201029. The next prime is 21020313201071. The reversal of 21020313201049 is 94010231302012.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13030165111824 + 7990148089225 = 3609732^2 + 2826685^2 .

It is a cyclic number.

It is not a de Polignac number, because 21020313201049 - 2²⁵ = 21020279646617 is a prime.

It is not a weakly prime, because it can be changed into another prime (21020313201029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10510156600524 + 10510156600525.

It is an arithmetic number, because the mean of its divisors is an integer number (10510156600525).

Almost surely, 2^{21020313201049} is an apocalyptic number.

It is an amenable number.

21020313201049 is a deficient number, since it is larger than the sum of its proper divisors (1).

21020313201049 is an equidigital number, since it uses as much as digits as its factorization.

21020313201049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 28.

The spelling of 21020313201049 in words is "twenty-one trillion, twenty billion, three hundred thirteen million, two hundred one thousand, forty-nine".