21450611105461 has 2 divisors, whose sum is σ = 21450611105462. Its totient is φ = 21450611105460.

The previous prime is 21450611105453. The next prime is 21450611105467. The reversal of 21450611105461 is 16450111605412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21371990310225 + 78620795236 = 4622985^2 + 280394^2 .

It is a cyclic number.

It is not a de Polignac number, because 21450611105461 - 2³ = 21450611105453 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21450611105461.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21450611105467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10725305552730 + 10725305552731.

It is an arithmetic number, because the mean of its divisors is an integer number (10725305552731).

Almost surely, 2^{21450611105461} is an apocalyptic number.

It is an amenable number.

21450611105461 is a deficient number, since it is larger than the sum of its proper divisors (1).

21450611105461 is an equidigital number, since it uses as much as digits as its factorization.

21450611105461 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28800, while the sum is 37.

The spelling of 21450611105461 in words is "twenty-one trillion, four hundred fifty billion, six hundred eleven million, one hundred five thousand, four hundred sixty-one".