21374263644641 has 2 divisors, whose sum is σ = 21374263644642. Its totient is φ = 21374263644640.

The previous prime is 21374263644631. The next prime is 21374263644649. The reversal of 21374263644641 is 14644636247312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19911264537616 + 1462999107025 = 4462204^2 + 1209545^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21374263644641 is a prime.

It is not a weakly prime, because it can be changed into another prime (21374263644649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10687131822320 + 10687131822321.

It is an arithmetic number, because the mean of its divisors is an integer number (10687131822321).

Almost surely, 2^{21374263644641} is an apocalyptic number.

It is an amenable number.

21374263644641 is a deficient number, since it is larger than the sum of its proper divisors (1).

21374263644641 is an equidigital number, since it uses as much as digits as its factorization.

21374263644641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13934592, while the sum is 53.

The spelling of 21374263644641 in words is "twenty-one trillion, three hundred seventy-four billion, two hundred sixty-three million, six hundred forty-four thousand, six hundred forty-one".