21374332310549 has 2 divisors, whose sum is σ = 21374332310550. Its totient is φ = 21374332310548.

The previous prime is 21374332310483. The next prime is 21374332310579. The reversal of 21374332310549 is 94501323347312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14385764222449 + 6988568088100 = 3792857^2 + 2643590^2 .

It is a cyclic number.

It is not a de Polignac number, because 21374332310549 - 2⁴⁰ = 20274820682773 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21374332310579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10687166155274 + 10687166155275.

It is an arithmetic number, because the mean of its divisors is an integer number (10687166155275).

Almost surely, 2^{21374332310549} is an apocalyptic number.

It is an amenable number.

21374332310549 is a deficient number, since it is larger than the sum of its proper divisors (1).

21374332310549 is an equidigital number, since it uses as much as digits as its factorization.

21374332310549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1632960, while the sum is 47.

The spelling of 21374332310549 in words is "twenty-one trillion, three hundred seventy-four billion, three hundred thirty-two million, three hundred ten thousand, five hundred forty-nine".