2121022202081 has 2 divisors, whose sum is σ = 2121022202082. Its totient is φ = 2121022202080.

The previous prime is 2121022201927. The next prime is 2121022202137. The reversal of 2121022202081 is 1802022201212.

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., 1467647446225 + 653374755856 = 1211465^2 + 808316^2 .

It is a cyclic number.

It is not a de Polignac number, because 2121022202081 - 2¹⁸ = 2121021939937 is a prime.

It is a super-2 number, since 2×2121022202081² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2121028202081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060511101040 + 1060511101041.

It is an arithmetic number, because the mean of its divisors is an integer number (1060511101041).

Almost surely, 2^{2121022202081} is an apocalyptic number.

It is an amenable number.

2121022202081 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121022202081 is an equidigital number, since it uses as much as digits as its factorization.

2121022202081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 512, while the sum is 23.

Adding to 2121022202081 its reverse (1802022201212), we get a palindrome (3923044403293).

The spelling of 2121022202081 in words is "two trillion, one hundred twenty-one billion, twenty-two million, two hundred two thousand, eighty-one".