20021221210153 has 2 divisors, whose sum is σ = 20021221210154. Its totient is φ = 20021221210152.

The previous prime is 20021221209971. The next prime is 20021221210171. The reversal of 20021221210153 is 35101212212002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19136101517289 + 885119692864 = 4374483^2 + 940808^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20021221210153 is a prime.

It is not a weakly prime, because it can be changed into another prime (20021221210253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10010610605076 + 10010610605077.

It is an arithmetic number, because the mean of its divisors is an integer number (10010610605077).

Almost surely, 2^{20021221210153} is an apocalyptic number.

It is an amenable number.

20021221210153 is a deficient number, since it is larger than the sum of its proper divisors (1).

20021221210153 is an equidigital number, since it uses as much as digits as its factorization.

20021221210153 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 480, while the sum is 22.

Adding to 20021221210153 its reverse (35101212212002), we get a palindrome (55122433422155).

The spelling of 20021221210153 in words is "twenty trillion, twenty-one billion, two hundred twenty-one million, two hundred ten thousand, one hundred fifty-three".