21224546415461 has 2 divisors, whose sum is σ = 21224546415462. Its totient is φ = 21224546415460.

The previous prime is 21224546415409. The next prime is 21224546415551. The reversal of 21224546415461 is 16451464542212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13696623801025 + 7527922614436 = 3700895^2 + 2743706^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21224546415461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21224546418461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10612273207730 + 10612273207731.

It is an arithmetic number, because the mean of its divisors is an integer number (10612273207731).

Almost surely, 2^{21224546415461} is an apocalyptic number.

It is an amenable number.

21224546415461 is a deficient number, since it is larger than the sum of its proper divisors (1).

21224546415461 is an equidigital number, since it uses as much as digits as its factorization.

21224546415461 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1843200, while the sum is 47.

The spelling of 21224546415461 in words is "twenty-one trillion, two hundred twenty-four billion, five hundred forty-six million, four hundred fifteen thousand, four hundred sixty-one".