20021233312121 has 2 divisors, whose sum is σ = 20021233312122. Its totient is φ = 20021233312120.

The previous prime is 20021233312103. The next prime is 20021233312133. The reversal of 20021233312121 is 12121333212002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18853493727721 + 1167739584400 = 4342061^2 + 1080620^2 .

It is a cyclic number.

It is not a de Polignac number, because 20021233312121 - 2⁶ = 20021233312057 is a prime.

It is not a weakly prime, because it can be changed into another prime (20021233312921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10010616656060 + 10010616656061.

It is an arithmetic number, because the mean of its divisors is an integer number (10010616656061).

Almost surely, 2^{20021233312121} is an apocalyptic number.

It is an amenable number.

20021233312121 is a deficient number, since it is larger than the sum of its proper divisors (1).

20021233312121 is an equidigital number, since it uses as much as digits as its factorization.

20021233312121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 20021233312121 its reverse (12121333212002), we get a palindrome (32142566524123).

The spelling of 20021233312121 in words is "twenty trillion, twenty-one billion, two hundred thirty-three million, three hundred twelve thousand, one hundred twenty-one".