21000012021349 has 2 divisors, whose sum is σ = 21000012021350. Its totient is φ = 21000012021348.

The previous prime is 21000012021301. The next prime is 21000012021361. The reversal of 21000012021349 is 94312021000012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16160641200900 + 4839370820449 = 4020030^2 + 2199857^2 .

It is a cyclic number.

It is not a de Polignac number, because 21000012021349 - 2²¹ = 21000009924197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21000012021749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500006010674 + 10500006010675.

It is an arithmetic number, because the mean of its divisors is an integer number (10500006010675).

Almost surely, 2^{21000012021349} is an apocalyptic number.

It is an amenable number.

21000012021349 is a deficient number, since it is larger than the sum of its proper divisors (1).

21000012021349 is an equidigital number, since it uses as much as digits as its factorization.

21000012021349 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 25.

The spelling of 21000012021349 in words is "twenty-one trillion, twelve million, twenty-one thousand, three hundred forty-nine".