20021222100961 has 2 divisors, whose sum is σ = 20021222100962. Its totient is φ = 20021222100960.

The previous prime is 20021222100931. The next prime is 20021222101171. The reversal of 20021222100961 is 16900122212002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18366847350336 + 1654374750625 = 4285656^2 + 1286225^2 .

It is a cyclic number.

It is not a de Polignac number, because 20021222100961 - 2¹⁵ = 20021222068193 is a prime.

It is not a weakly prime, because it can be changed into another prime (20021222100931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10010611050480 + 10010611050481.

It is an arithmetic number, because the mean of its divisors is an integer number (10010611050481).

Almost surely, 2^{20021222100961} is an apocalyptic number.

It is an amenable number.

20021222100961 is a deficient number, since it is larger than the sum of its proper divisors (1).

20021222100961 is an equidigital number, since it uses as much as digits as its factorization.

20021222100961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 28.

Adding to 20021222100961 its reverse (16900122212002), we get a palindrome (36921344312963).

The spelling of 20021222100961 in words is "twenty trillion, twenty-one billion, two hundred twenty-two million, one hundred thousand, nine hundred sixty-one".