21140525340349 has 2 divisors, whose sum is σ = 21140525340350. Its totient is φ = 21140525340348.

The previous prime is 21140525340331. The next prime is 21140525340401. The reversal of 21140525340349 is 94304352504112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13658013705625 + 7482511634724 = 3695675^2 + 2735418^2 .

It is a cyclic number.

It is not a de Polignac number, because 21140525340349 - 2⁴¹ = 18941502084797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21140525340449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10570262670174 + 10570262670175.

It is an arithmetic number, because the mean of its divisors is an integer number (10570262670175).

Almost surely, 2^{21140525340349} is an apocalyptic number.

It is an amenable number.

21140525340349 is a deficient number, since it is larger than the sum of its proper divisors (1).

21140525340349 is an equidigital number, since it uses as much as digits as its factorization.

21140525340349 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 518400, while the sum is 43.

The spelling of 21140525340349 in words is "twenty-one trillion, one hundred forty billion, five hundred twenty-five million, three hundred forty thousand, three hundred forty-nine".