21207854341 has 2 divisors, whose sum is σ = 21207854342. Its totient is φ = 21207854340.

The previous prime is 21207854293. The next prime is 21207854377. The reversal of 21207854341 is 14345870212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14082806241 + 7125048100 = 118671^2 + 84410^2 .

It is a cyclic number.

It is not a de Polignac number, because 21207854341 - 2¹⁵ = 21207821573 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21207854341.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21207854641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10603927170 + 10603927171.

It is an arithmetic number, because the mean of its divisors is an integer number (10603927171).

Almost surely, 2^21207854341 is an apocalyptic number.

It is an amenable number.

21207854341 is a deficient number, since it is larger than the sum of its proper divisors (1).

21207854341 is an equidigital number, since it uses as much as digits as its factorization.

21207854341 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 53760, while the sum is 37.

The spelling of 21207854341 in words is "twenty-one billion, two hundred seven million, eight hundred fifty-four thousand, three hundred forty-one".