21000020270353 has 2 divisors, whose sum is σ = 21000020270354. Its totient is φ = 21000020270352.

The previous prime is 21000020270329. The next prime is 21000020270389. The reversal of 21000020270353 is 35307202000012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20985451056144 + 14569214209 = 4580988^2 + 120703^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21000020270353 is a prime.

It is not a weakly prime, because it can be changed into another prime (21000020270303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500010135176 + 10500010135177.

It is an arithmetic number, because the mean of its divisors is an integer number (10500010135177).

Almost surely, 2^{21000020270353} is an apocalyptic number.

It is an amenable number.

21000020270353 is a deficient number, since it is larger than the sum of its proper divisors (1).

21000020270353 is an equidigital number, since it uses as much as digits as its factorization.

21000020270353 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2520, while the sum is 25.

Adding to 21000020270353 its reverse (35307202000012), we get a palindrome (56307222270365).

The spelling of 21000020270353 in words is "twenty-one trillion, twenty million, two hundred seventy thousand, three hundred fifty-three".