20120121211 has 2 divisors, whose sum is σ = 20120121212. Its totient is φ = 20120121210.

The previous prime is 20120121199. The next prime is 20120121247. The reversal of 20120121211 is 11212102102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20120121211 - 2⁵ = 20120121179 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20120121191 and 20120121200.

It is not a weakly prime, because it can be changed into another prime (20120121311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060060605 + 10060060606.

It is an arithmetic number, because the mean of its divisors is an integer number (10060060606).

Almost surely, 2^20120121211 is an apocalyptic number.

20120121211 is a deficient number, since it is larger than the sum of its proper divisors (1).

20120121211 is an equidigital number, since it uses as much as digits as its factorization.

20120121211 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 20120121211 its reverse (11212102102), we get a palindrome (31332223313).

The spelling of 20120121211 in words is "twenty billion, one hundred twenty million, one hundred twenty-one thousand, two hundred eleven".