20021212222001 has 2 divisors, whose sum is σ = 20021212222002. Its totient is φ = 20021212222000.

The previous prime is 20021212221971. The next prime is 20021212222009. The reversal of 20021212222001 is 10022221212002.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18021519270976 + 1999692951025 = 4245176^2 + 1414105^2 .

It is a cyclic number.

It is not a de Polignac number, because 20021212222001 - 2⁶ = 20021212221937 is a prime.

It is not a weakly prime, because it can be changed into another prime (20021212222009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10010606111000 + 10010606111001.

It is an arithmetic number, because the mean of its divisors is an integer number (10010606111001).

Almost surely, 2^{20021212222001} is an apocalyptic number.

It is an amenable number.

20021212222001 is a deficient number, since it is larger than the sum of its proper divisors (1).

20021212222001 is an equidigital number, since it uses as much as digits as its factorization.

20021212222001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 20021212222001 its reverse (10022221212002), we get a palindrome (30043433434003).

The spelling of 20021212222001 in words is "twenty trillion, twenty-one billion, two hundred twelve million, two hundred twenty-two thousand, one".