20021012217953 has 2 divisors, whose sum is σ = 20021012217954. Its totient is φ = 20021012217952.

The previous prime is 20021012217889. The next prime is 20021012217959. The reversal of 20021012217953 is 35971221012002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19400087129809 + 620925088144 = 4404553^2 + 787988^2 .

It is a cyclic number.

It is not a de Polignac number, because 20021012217953 - 2⁶ = 20021012217889 is a prime.

It is not a weakly prime, because it can be changed into another prime (20021012217959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10010506108976 + 10010506108977.

It is an arithmetic number, because the mean of its divisors is an integer number (10010506108977).

Almost surely, 2^{20021012217953} is an apocalyptic number.

It is an amenable number.

20021012217953 is a deficient number, since it is larger than the sum of its proper divisors (1).

20021012217953 is an equidigital number, since it uses as much as digits as its factorization.

20021012217953 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15120, while the sum is 35.

Adding to 20021012217953 its reverse (35971221012002), we get a palindrome (55992233229955).

The spelling of 20021012217953 in words is "twenty trillion, twenty-one billion, twelve million, two hundred seventeen thousand, nine hundred fifty-three".