20002212121081 has 2 divisors, whose sum is σ = 20002212121082. Its totient is φ = 20002212121080.

The previous prime is 20002212121007. The next prime is 20002212121169. The reversal of 20002212121081 is 18012121220002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19659646566400 + 342565554681 = 4433920^2 + 585291^2 .

It is a cyclic number.

It is not a de Polignac number, because 20002212121081 - 2²⁵ = 20002178566649 is a prime.

It is a super-2 number, since 2×20002212121081² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20002212221081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10001106060540 + 10001106060541.

It is an arithmetic number, because the mean of its divisors is an integer number (10001106060541).

Almost surely, 2^{20002212121081} is an apocalyptic number.

It is an amenable number.

20002212121081 is a deficient number, since it is larger than the sum of its proper divisors (1).

20002212121081 is an equidigital number, since it uses as much as digits as its factorization.

20002212121081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 256, while the sum is 22.

Adding to 20002212121081 its reverse (18012121220002), we get a palindrome (38014333341083).

The spelling of 20002212121081 in words is "twenty trillion, two billion, two hundred twelve million, one hundred twenty-one thousand, eighty-one".