20899621725277 has 2 divisors, whose sum is σ = 20899621725278. Its totient is φ = 20899621725276.

The previous prime is 20899621725247. The next prime is 20899621725317. The reversal of 20899621725277 is 77252712699802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17160712217401 + 3738909507876 = 4142549^2 + 1933626^2 .

It is a cyclic number.

It is not a de Polignac number, because 20899621725277 - 2¹⁹ = 20899621200989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20899621725217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10449810862638 + 10449810862639.

It is an arithmetic number, because the mean of its divisors is an integer number (10449810862639).

Almost surely, 2^{20899621725277} is an apocalyptic number.

It is an amenable number.

20899621725277 is a deficient number, since it is larger than the sum of its proper divisors (1).

20899621725277 is an equidigital number, since it uses as much as digits as its factorization.

20899621725277 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 106686720, while the sum is 67.

The spelling of 20899621725277 in words is "twenty trillion, eight hundred ninety-nine billion, six hundred twenty-one million, seven hundred twenty-five thousand, two hundred seventy-seven".