20221221201029 has 2 divisors, whose sum is σ = 20221221201030. Its totient is φ = 20221221201028.

The previous prime is 20221221200989. The next prime is 20221221201043. The reversal of 20221221201029 is 92010212212202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16995641120929 + 3225580080100 = 4122577^2 + 1795990^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20221221201029 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20221221200989 and 20221221201007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20221221201529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10110610600514 + 10110610600515.

It is an arithmetic number, because the mean of its divisors is an integer number (10110610600515).

Almost surely, 2^{20221221201029} is an apocalyptic number.

It is an amenable number.

20221221201029 is a deficient number, since it is larger than the sum of its proper divisors (1).

20221221201029 is an equidigital number, since it uses as much as digits as its factorization.

20221221201029 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 26.

The spelling of 20221221201029 in words is "twenty trillion, two hundred twenty-one billion, two hundred twenty-one million, two hundred one thousand, twenty-nine".