21822863556061 has 2 divisors, whose sum is σ = 21822863556062. Its totient is φ = 21822863556060.

The previous prime is 21822863556037. The next prime is 21822863556133. The reversal of 21822863556061 is 16065536822812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17203158133561 + 4619705422500 = 4147669^2 + 2149350^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21822863556061 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21822863555993 and 21822863556011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21822863559061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10911431778030 + 10911431778031.

It is an arithmetic number, because the mean of its divisors is an integer number (10911431778031).

Almost surely, 2^{21822863556061} is an apocalyptic number.

It is an amenable number.

21822863556061 is a deficient number, since it is larger than the sum of its proper divisors (1).

21822863556061 is an equidigital number, since it uses as much as digits as its factorization.

21822863556061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8294400, while the sum is 55.

The spelling of 21822863556061 in words is "twenty-one trillion, eight hundred twenty-two billion, eight hundred sixty-three million, five hundred fifty-six thousand, sixty-one".