20121211001 has 2 divisors, whose sum is σ = 20121211002. Its totient is φ = 20121211000.

The previous prime is 20121210859. The next prime is 20121211021. The reversal of 20121211001 is 10011212102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18169692025 + 1951518976 = 134795^2 + 44176^2 .

It is a cyclic number.

It is not a de Polignac number, because 20121211001 - 2²² = 20117016697 is a prime.

It is not a weakly prime, because it can be changed into another prime (20121211021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060605500 + 10060605501.

It is an arithmetic number, because the mean of its divisors is an integer number (10060605501).

Almost surely, 2^20121211001 is an apocalyptic number.

It is an amenable number.

20121211001 is a deficient number, since it is larger than the sum of its proper divisors (1).

20121211001 is an equidigital number, since it uses as much as digits as its factorization.

20121211001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 20121211001 its reverse (10011212102), we get a palindrome (30132423103).

The spelling of 20121211001 in words is "twenty billion, one hundred twenty-one million, two hundred eleven thousand, one".