21012120221293 has 2 divisors, whose sum is σ = 21012120221294. Its totient is φ = 21012120221292.

The previous prime is 21012120221171. The next prime is 21012120221341. The reversal of 21012120221293 is 39212202121012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17957745324964 + 3054374896329 = 4237658^2 + 1747677^2 .

It is a cyclic number.

It is not a de Polignac number, because 21012120221293 - 2⁹ = 21012120220781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21012120221693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10506060110646 + 10506060110647.

It is an arithmetic number, because the mean of its divisors is an integer number (10506060110647).

Almost surely, 2^{21012120221293} is an apocalyptic number.

It is an amenable number.

21012120221293 is a deficient number, since it is larger than the sum of its proper divisors (1).

21012120221293 is an equidigital number, since it uses as much as digits as its factorization.

21012120221293 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 28.

The spelling of 21012120221293 in words is "twenty-one trillion, twelve billion, one hundred twenty million, two hundred twenty-one thousand, two hundred ninety-three".