202012220021 has 2 divisors, whose sum is σ = 202012220022. Its totient is φ = 202012220020.

The previous prime is 202012219991. The next prime is 202012220117. The reversal of 202012220021 is 120022210202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 198154071025 + 3858148996 = 445145^2 + 62114^2 .

It is a cyclic number.

It is not a de Polignac number, because 202012220021 - 2¹⁴ = 202012203637 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 202012219978 and 202012220005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (202012250021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101006110010 + 101006110011.

It is an arithmetic number, because the mean of its divisors is an integer number (101006110011).

Almost surely, 2^202012220021 is an apocalyptic number.

It is an amenable number.

202012220021 is a deficient number, since it is larger than the sum of its proper divisors (1).

202012220021 is an equidigital number, since it uses as much as digits as its factorization.

202012220021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 202012220021 its reverse (120022210202), we get a palindrome (322034430223).

The spelling of 202012220021 in words is "two hundred two billion, twelve million, two hundred twenty thousand, twenty-one".