21012101210773 has 2 divisors, whose sum is σ = 21012101210774. Its totient is φ = 21012101210772.

The previous prime is 21012101210759. The next prime is 21012101210827. The reversal of 21012101210773 is 37701210121012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12350958158449 + 8661143052324 = 3514393^2 + 2942982^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21012101210773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21012101210713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10506050605386 + 10506050605387.

It is an arithmetic number, because the mean of its divisors is an integer number (10506050605387).

Almost surely, 2^{21012101210773} is an apocalyptic number.

It is an amenable number.

21012101210773 is a deficient number, since it is larger than the sum of its proper divisors (1).

21012101210773 is an equidigital number, since it uses as much as digits as its factorization.

21012101210773 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1176, while the sum is 28.

Adding to 21012101210773 its reverse (37701210121012), we get a palindrome (58713311331785).

The spelling of 21012101210773 in words is "twenty-one trillion, twelve billion, one hundred one million, two hundred ten thousand, seven hundred seventy-three".