20021012121211 has 2 divisors, whose sum is σ = 20021012121212. Its totient is φ = 20021012121210.

The previous prime is 20021012121191. The next prime is 20021012121221. The reversal of 20021012121211 is 11212121012002.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20021012121211 - 2¹⁷ = 20021011990139 is a prime.

It is a super-2 number, since 2×20021012121211² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20021012121221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10010506060605 + 10010506060606.

It is an arithmetic number, because the mean of its divisors is an integer number (10010506060606).

Almost surely, 2^{20021012121211} is an apocalyptic number.

20021012121211 is a deficient number, since it is larger than the sum of its proper divisors (1).

20021012121211 is an equidigital number, since it uses as much as digits as its factorization.

20021012121211 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 20021012121211 its reverse (11212121012002), we get a palindrome (31233133133213).

The spelling of 20021012121211 in words is "twenty trillion, twenty-one billion, twelve million, one hundred twenty-one thousand, two hundred eleven".